/**!
 * Sortable 1.15.0
 * @author    RubaXa   <trash@rubaxa.org>
 * @author    owenm    <owen23355@gmail.com>
 * @license MIT
 */
(function (global, factory) {
    typeof exports === 'object' && typeof module !== 'undefined' ? module.exports = factory() :
        typeof define === 'function' && define.amd ? define(factory) :
            (global = global || self, global.Sortable = factory());
}(this, (function () {
    'use strict';

    function ownKeys(object, enumerableOnly) {
        var keys = Object.keys(object);

        if (Object.getOwnPropertySymbols) {
            var symbols = Object.getOwnPropertySymbols(object);

            if (enumerableOnly) {
                symbols = symbols.filter(function (sym) {
                    return Object.getOwnPropertyDescriptor(object, sym).enumerable;
                });
            }

            keys.push.apply(keys, symbols);
        }

        return keys;
    }

    function _objectSpread2(target) {
        for (var i = 1; i < arguments.length; i++) {
            var source = arguments[i] != null ? arguments[i] : {};

            if (i % 2) {
                ownKeys(Object(source), true).forEach(function (key) {
                    _defineProperty(target, key, source[key]);
                });
            } else if (Object.getOwnPropertyDescriptors) {
                Object.defineProperties(target, Object.getOwnPropertyDescriptors(source));
            } else {
                ownKeys(Object(source)).forEach(function (key) {
                    Object.defineProperty(target, key, Object.getOwnPropertyDescriptor(source, key));
                });
            }
        }

        return target;
    }

    function _typeof(obj) {
        "@babel/helpers - typeof";

        if (typeof Symbol === "function" && typeof Symbol.iterator === "symbol") {
            _typeof = function (obj) {
                return typeof obj;
            };
        } else {
            _typeof = function (obj) {
                return obj && typeof Symbol === "function" && obj.constructor === Symbol && obj !== Symbol.prototype ? "symbol" : typeof obj;
            };
        }

        return _typeof(obj);
    }

    function _defineProperty(obj, key, value) {
        if (key in obj) {
            Object.defineProperty(obj, key, {
                value: value,
                enumerable: true,
                configurable: true,
                writable: true
            });
        } else {
            obj[key] = value;
        }

        return obj;
    }

    function _extends() {
        _extends = Object.assign || function (target) {
            for (var i = 1; i < arguments.length; i++) {
                var source = arguments[i];

                for (var key in source) {
                    if (Object.prototype.hasOwnProperty.call(source, key)) {
                        target[key] = source[key];
                    }
                }
            }

            return target;
        };

        return _extends.apply(this, arguments);
    }

    function _objectWithoutPropertiesLoose(source, excluded) {
        if (source == null) return {};
        var target = {};
        var sourceKeys = Object.keys(source);
        var key, i;

        for (i = 0; i < sourceKeys.length; i++) {
            key = sourceKeys[i];
            if (excluded.indexOf(key) >= 0) continue;
            target[key] = source[key];
        }

        return target;
    }

    function _objectWithoutProperties(source, excluded) {
        if (source == null) return {};

        var target = _objectWithoutPropertiesLoose(source, excluded);

        var key, i;

        if (Object.getOwnPropertySymbols) {
            var sourceSymbolKeys = Object.getOwnPropertySymbols(source);

            for (i = 0; i < sourceSymbolKeys.length; i++) {
                key = sourceSymbolKeys[i];
                if (excluded.indexOf(key) >= 0) continue;
                if (!Object.prototype.propertyIsEnumerable.call(source, key)) continue;
                target[key] = source[key];
            }
        }

        return target;
    }

    function _toConsumableArray(arr) {
        return _arrayWithoutHoles(arr) || _iterableToArray(arr) || _unsupportedIterableToArray(arr) || _nonIterableSpread();
    }

    function _arrayWithoutHoles(arr) {
        if (Array.isArray(arr)) return _arrayLikeToArray(arr);
    }

    function _iterableToArray(iter) {
        if (typeof Symbol !== "undefined" && iter[Symbol.iterator] != null || iter["@@iterator"] != null) return Array.from(iter);
    }

    function _unsupportedIterableToArray(o, minLen) {
        if (!o) return;
        if (typeof o === "string") return _arrayLikeToArray(o, minLen);
        var n = Object.prototype.toString.call(o).slice(8, -1);
        if (n === "Object" && o.constructor) n = o.constructor.name;
        if (n === "Map" || n === "Set") return Array.from(o);
        if (n === "Arguments" || /^(?:Ui|I)nt(?:8|16|32)(?:Clamped)?Array$/.test(n)) return _arrayLikeToArray(o, minLen);
    }

    function _arrayLikeToArray(arr, len) {
        if (len == null || len > arr.length) len = arr.length;

        for (var i = 0, arr2 = new Array(len); i < len; i++) arr2[i] = arr[i];

        return arr2;
    }

    function _nonIterableSpread() {
        throw new TypeError("Invalid attempt to spread non-iterable instance.\nIn order to be iterable, non-array objects must have a [Symbol.iterator]() method.");
    }

    var version = "1.15.0";

    function userAgent(pattern) {
        if (typeof window !== 'undefined' && window.navigator) {
            return !! /*@__PURE__*/navigator.userAgent.match(pattern);
        }
    }

    var IE11OrLess = userAgent(/(?:Trident.*rv[ :]?11\.|msie|iemobile|Windows Phone)/i);
    var Edge = userAgent(/Edge/i);
    var FireFox = userAgent(/firefox/i);
    var Safari = userAgent(/safari/i) && !userAgent(/chrome/i) && !userAgent(/android/i);
    var IOS = userAgent(/iP(ad|od|hone)/i);
    var ChromeForAndroid = userAgent(/chrome/i) && userAgent(/android/i);

    var captureMode = {
        capture: false,
        passive: false
    };

    function on(el, event, fn) {
        el.addEventListener(event, fn, !IE11OrLess && captureMode);
    }

    function off(el, event, fn) {
        el.removeEventListener(event, fn, !IE11OrLess && captureMode);
    }

    function matches(
        /**HTMLElement*/
        el,
        /**String*/
        selector) {
        if (!selector) return;
        selector[0] === '>' && (selector = selector.substring(1));

        if (el) {
            try {
                if (el.matches) {
                    return el.matches(selector);
                } else if (el.msMatchesSelector) {
                    return el.msMatchesSelector(selector);
                } else if (el.webkitMatchesSelector) {
                    return el.webkitMatchesSelector(selector);
                }
            } catch (_) {
                return false;
            }
        }

        return false;
    }

    function getParentOrHost(el) {
        return el.host && el !== document && el.host.nodeType ? el.host : el.parentNode;
    }

    function closest(
        /**HTMLElement*/
        el,
        /**String*/
        selector,
        /**HTMLElement*/
        ctx, includeCTX) {
        if (el) {
            ctx = ctx || document;

            do {
                if (selector != null && (selector[0] === '>' ? el.parentNode === ctx && matches(el, selector) : matches(el, selector)) || includeCTX && el === ctx) {
                    return el;
                }

                if (el === ctx) break;
                /* jshint boss:true */
            } while (el = getParentOrHost(el));
        }

        return null;
    }

    var R_SPACE = /\s+/g;

    function toggleClass(el, name, state) {
        if (el && name) {
            if (el.classList) {
                el.classList[state ? 'add' : 'remove'](name);
            } else {
                var className = (' ' + el.className + ' ').replace(R_SPACE, ' ').replace(' ' + name + ' ', ' ');
                el.className = (className + (state ? ' ' + name : '')).replace(R_SPACE, ' ');
            }
        }
    }

    function css(el, prop, val) {
        var style = el && el.style;

        if (style) {
            if (val === void 0) {
                if (document.defaultView && document.defaultView.getComputedStyle) {
                    val = document.defaultView.getComputedStyle(el, '');
                } else if (el.currentStyle) {
                    val = el.currentStyle;
                }

                return prop === void 0 ? val : val[prop];
            } else {
                if (!(prop in style) && prop.indexOf('webkit') === -1) {
                    prop = '-webkit-' + prop;
                }

                style[prop] = val + (typeof val === 'string' ? '' : 'px');
            }
        }
    }

    function matrix(el, selfOnly) {
        var appliedTransforms = '';

        if (typeof el === 'string') {
            appliedTransforms = el;
        } else {
            do {
                var transform = css(el, 'transform');

                if (transform && transform !== 'none') {
                    appliedTransforms = transform + ' ' + appliedTransforms;
                }
                /* jshint boss:true */

            } while (!selfOnly && (el = el.parentNode));
        }

        var matrixFn = window.DOMMatrix || window.WebKitCSSMatrix || window.CSSMatrix || window.MSCSSMatrix;
        /*jshint -W056 */

        return matrixFn && new matrixFn(appliedTransforms);
    }

    function find(ctx, tagName, iterator) {
        if (ctx) {
            var list = ctx.getElementsByTagName(tagName),
                i = 0,
                n = list.length;

            if (iterator) {
                for (; i < n; i++) {
                    iterator(list[i], i);
                }
            }

            return list;
        }

        return [];
    }

    function getWindowScrollingElement() {
        var scrollingElement = document.scrollingElement;

        if (scrollingElement) {
            return scrollingElement;
        } else {
            return document.documentElement;
        }
    }

    /**
     * Returns the "bounding client rect" of given element
     * @param  {HTMLElement} el                       The element whose boundingClientRect is wanted
     * @param  {[Boolean]} relativeToContainingBlock  Whether the rect should be relative to the containing block of (including) the container
     * @param  {[Boolean]} relativeToNonStaticParent  Whether the rect should be relative to the relative parent of (including) the contaienr
     * @param  {[Boolean]} undoScale                  Whether the container's scale() should be undone
     * @param  {[HTMLElement]} container              The parent the element will be placed in
     * @return {Object}                               The boundingClientRect of el, with specified adjustments
     */


    function getRect(el, relativeToContainingBlock, relativeToNonStaticParent, undoScale, container) {
        if (!el.getBoundingClientRect && el !== window) return;
        var elRect, top, left, bottom, right, height, width;

        if (el !== window && el.parentNode && el !== getWindowScrollingElement()) {
            elRect = el.getBoundingClientRect();
            top = elRect.top;
            left = elRect.left;
            bottom = elRect.bottom;
            right = elRect.right;
            height = elRect.height;
            width = elRect.width;
        } else {
            top = 0;
            left = 0;
            bottom = window.innerHeight;
            right = window.innerWidth;
            height = window.innerHeight;
            width = window.innerWidth;
        }

        if ((relativeToContainingBlock || relativeToNonStaticParent) && el !== window) {
            // Adjust for translate()
            container = container || el.parentNode; // solves #1123 (see: https://stackoverflow.com/a/37953806/6088312)
            // Not needed on <= IE11

            if (!IE11OrLess) {
                do {
                    if (container && container.getBoundingClientRect && (css(container, 'transform') !== 'none' || relativeToNonStaticParent && css(container, 'position') !== 'static')) {
                        var containerRect = container.getBoundingClientRect(); // Set relative to edges of padding box of container

                        top -= containerRect.top + parseInt(css(container, 'border-top-width'));
                        left -= containerRect.left + parseInt(css(container, 'border-left-width'));
                        bottom = top + elRect.height;
                        right = left + elRect.width;
                        break;
                    }
                    /* jshint boss:true */

                } while (container = container.parentNode);
            }
        }

        if (undoScale && el !== window) {
            // Adjust for scale()
            var elMatrix = matrix(container || el),
                scaleX = elMatrix && elMatrix.a,
                scaleY = elMatrix && elMatrix.d;

            if (elMatrix) {
                top /= scaleY;
                left /= scaleX;
                width /= scaleX;
                height /= scaleY;
                bottom = top + height;
                right = left + width;
            }
        }

        return {
            top: top,
            left: left,
            bottom: bottom,
            right: right,
            width: width,
            height: height
        };
    }

    /**
     * Checks if a side of an element is scrolled past a side of its parents
     * @param  {HTMLElement}  el           The element who's side being scrolled out of view is in question
     * @param  {String}       elSide       Side of the element in question ('top', 'left', 'right', 'bottom')
     * @param  {String}       parentSide   Side of the parent in question ('top', 'left', 'right', 'bottom')
     * @return {HTMLElement}               The parent scroll element that the el's side is scrolled past, or null if there is no such element
     */


    function isScrolledPast(el, elSide, parentSide) {
        var parent = getParentAutoScrollElement(el, true),
            elSideVal = getRect(el)[elSide];
        /* jshint boss:true */

        while (parent) {
            var parentSideVal = getRect(parent)[parentSide],
                visible = void 0;

            if (parentSide === 'top' || parentSide === 'left') {
                visible = elSideVal >= parentSideVal;
            } else {
                visible = elSideVal <= parentSideVal;
            }

            if (!visible) return parent;
            if (parent === getWindowScrollingElement()) break;
            parent = getParentAutoScrollElement(parent, false);
        }

        return false;
    }

    /**
     * Gets nth child of el, ignoring hidden children, sortable's elements (does not ignore clone if it's visible)
     * and non-draggable elements
     * @param  {HTMLElement} el       The parent element
     * @param  {Number} childNum      The index of the child
     * @param  {Object} options       Parent Sortable's options
     * @return {HTMLElement}          The child at index childNum, or null if not found
     */


    function getChild(el, childNum, options, includeDragEl) {
        var currentChild = 0,
            i = 0,
            children = el.children;

        while (i < children.length) {
            if (children[i].style.display !== 'none' && children[i] !== Sortable.ghost && (includeDragEl || children[i] !== Sortable.dragged) && closest(children[i], options.draggable, el, false)) {
                if (currentChild === childNum) {
                    return children[i];
                }

                currentChild++;
            }

            i++;
        }

        return null;
    }

    /**
     * Gets the last child in the el, ignoring ghostEl or invisible elements (clones)
     * @param  {HTMLElement} el       Parent element
     * @param  {selector} selector    Any other elements that should be ignored
     * @return {HTMLElement}          The last child, ignoring ghostEl
     */


    function lastChild(el, selector) {
        var last = el.lastElementChild;

        while (last && (last === Sortable.ghost || css(last, 'display') === 'none' || selector && !matches(last, selector))) {
            last = last.previousElementSibling;
        }

        return last || null;
    }

    /**
     * Returns the index of an element within its parent for a selected set of
     * elements
     * @param  {HTMLElement} el
     * @param  {selector} selector
     * @return {number}
     */


    function index(el, selector) {
        var index = 0;

        if (!el || !el.parentNode) {
            return -1;
        }
        /* jshint boss:true */


        while (el = el.previousElementSibling) {
            if (el.nodeName.toUpperCase() !== 'TEMPLATE' && el !== Sortable.clone && (!selector || matches(el, selector))) {
                index++;
            }
        }

        return index;
    }

    /**
     * Returns the scroll offset of the given element, added with all the scroll offsets of parent elements.
     * The value is returned in real pixels.
     * @param  {HTMLElement} el
     * @return {Array}             Offsets in the format of [left, top]
     */


    function getRelativeScrollOffset(el) {
        var offsetLeft = 0,
            offsetTop = 0,
            winScroller = getWindowScrollingElement();

        if (el) {
            do {
                var elMatrix = matrix(el),
                    scaleX = elMatrix.a,
                    scaleY = elMatrix.d;
                offsetLeft += el.scrollLeft * scaleX;
                offsetTop += el.scrollTop * scaleY;
            } while (el !== winScroller && (el = el.parentNode));
        }

        return [offsetLeft, offsetTop];
    }

    /**
     * Returns the index of the object within the given array
     * @param  {Array} arr   Array that may or may not hold the object
     * @param  {Object} obj  An object that has a key-value pair unique to and identical to a key-value pair in the object you want to find
     * @return {Number}      The index of the object in the array, or -1
     */


    function indexOfObject(arr, obj) {
        for (var i in arr) {
            if (!arr.hasOwnProperty(i)) continue;

            for (var key in obj) {
                if (obj.hasOwnProperty(key) && obj[key] === arr[i][key]) return Number(i);
            }
        }

        return -1;
    }

    function getParentAutoScrollElement(el, includeSelf) {
        // skip to window
        if (!el || !el.getBoundingClientRect) return getWindowScrollingElement();
        var elem = el;
        var gotSelf = false;

        do {
            // we don't need to get elem css if it isn't even overflowing in the first place (performance)
            if (elem.clientWidth < elem.scrollWidth || elem.clientHeight < elem.scrollHeight) {
                var elemCSS = css(elem);

                if (elem.clientWidth < elem.scrollWidth && (elemCSS.overflowX == 'auto' || elemCSS.overflowX == 'scroll') || elem.clientHeight < elem.scrollHeight && (elemCSS.overflowY == 'auto' || elemCSS.overflowY == 'scroll')) {
                    if (!elem.getBoundingClientRect || elem === document.body) return getWindowScrollingElement();
                    if (gotSelf || includeSelf) return elem;
                    gotSelf = true;
                }
            }
            /* jshint boss:true */

        } while (elem = elem.parentNode);

        return getWindowScrollingElement();
    }

    function extend(dst, src) {
        if (dst && src) {
            for (var key in src) {
                if (src.hasOwnProperty(key)) {
                    dst[key] = src[key];
                }
            }
        }

        return dst;
    }

    function isRectEqual(rect1, rect2) {
        return Math.round(rect1.top) === Math.round(rect2.top) && Math.round(rect1.left) === Math.round(rect2.left) && Math.round(rect1.height) === Math.round(rect2.height) && Math.round(rect1.width) === Math.round(rect2.width);
    }

    var _throttleTimeout;

    function throttle(callback, ms) {
        return function () {
            if (!_throttleTimeout) {
                var args = arguments,
                    _this = this;

                if (args.length === 1) {
                    callback.call(_this, args[0]);
                } else {
                    callback.apply(_this, args);
                }

                _throttleTimeout = setTimeout(function () {
                    _throttleTimeout = void 0;
                }, ms);
            }
        };
    }

    function cancelThrottle() {
        clearTimeout(_throttleTimeout);
        _throttleTimeout = void 0;
    }

    function scrollBy(el, x, y) {
        el.scrollLeft += x;
        el.scrollTop += y;
    }

    function clone(el) {
        var Polymer = window.Polymer;
        var $ = window.jQuery || window.Zepto;

        if (Polymer && Polymer.dom) {
            return Polymer.dom(el).cloneNode(true);
        } else if ($) {
            return $(el).clone(true)[0];
        } else {
            return el.cloneNode(true);
        }
    }

    function setRect(el, rect) {
        css(el, 'position', 'absolute');
        css(el, 'top', rect.top);
        css(el, 'left', rect.left);
        css(el, 'width', rect.width);
        css(el, 'height', rect.height);
    }

    function unsetRect(el) {
        css(el, 'position', '');
        css(el, 'top', '');
        css(el, 'left', '');
        css(el, 'width', '');
        css(el, 'height', '');
    }

    var expando = 'Sortable' + new Date().getTime();

    function AnimationStateManager() {
        var animationStates = [],
            animationCallbackId;
        return {
            captureAnimationState: function captureAnimationState() {
                animationStates = [];
                if (!this.options.animation) return;
                var children = [].slice.call(this.el.children);
                children.forEach(function (child) {
                    if (css(child, 'display') === 'none' || child === Sortable.ghost) return;
                    animationStates.push({
                        target: child,
                        rect: getRect(child)
                    });

                    var fromRect = _objectSpread2({}, animationStates[animationStates.length - 1].rect); // If animating: compensate for current animation


                    if (child.thisAnimationDuration) {
                        var childMatrix = matrix(child, true);

                        if (childMatrix) {
                            fromRect.top -= childMatrix.f;
                            fromRect.left -= childMatrix.e;
                        }
                    }

                    child.fromRect = fromRect;
                });
            },
            addAnimationState: function addAnimationState(state) {
                animationStates.push(state);
            },
            removeAnimationState: function removeAnimationState(target) {
                animationStates.splice(indexOfObject(animationStates, {
                    target: target
                }), 1);
            },
            animateAll: function animateAll(callback) {
                var _this = this;

                if (!this.options.animation) {
                    clearTimeout(animationCallbackId);
                    if (typeof callback === 'function') callback();
                    return;
                }

                var animating = false,
                    animationTime = 0;
                animationStates.forEach(function (state) {
                    var time = 0,
                        target = state.target,
                        fromRect = target.fromRect,
                        toRect = getRect(target),
                        prevFromRect = target.prevFromRect,
                        prevToRect = target.prevToRect,
                        animatingRect = state.rect,
                        targetMatrix = matrix(target, true);

                    if (targetMatrix) {
                        // Compensate for current animation
                        toRect.top -= targetMatrix.f;
                        toRect.left -= targetMatrix.e;
                    }

                    target.toRect = toRect;

                    if (target.thisAnimationDuration) {
                        // Could also check if animatingRect is between fromRect and toRect
                        if (isRectEqual(prevFromRect, toRect) && !isRectEqual(fromRect, toRect) && // Make sure animatingRect is on line between toRect & fromRect
                            (animatingRect.top - toRect.top) / (animatingRect.left - toRect.left) === (fromRect.top - toRect.top) / (fromRect.left - toRect.left)) {
                            // If returning to same place as started from animation and on same axis
                            time = calculateRealTime(animatingRect, prevFromRect, prevToRect, _this.options);
                        }
                    } // if fromRect != toRect: animate


                    if (!isRectEqual(toRect, fromRect)) {
                        target.prevFromRect = fromRect;
                        target.prevToRect = toRect;

                        if (!time) {
                            time = _this.options.animation;
                        }

                        _this.animate(target, animatingRect, toRect, time);
                    }

                    if (time) {
                        animating = true;
                        animationTime = Math.max(animationTime, time);
                        clearTimeout(target.animationResetTimer);
                        target.animationResetTimer = setTimeout(function () {
                            target.animationTime = 0;
                            target.prevFromRect = null;
                            target.fromRect = null;
                            target.prevToRect = null;
                            target.thisAnimationDuration = null;
                        }, time);
                        target.thisAnimationDuration = time;
                    }
                });
                clearTimeout(animationCallbackId);

                if (!animating) {
                    if (typeof callback === 'function') callback();
                } else {
                    animationCallbackId = setTimeout(function () {
                        if (typeof callback === 'function') callback();
                    }, animationTime);
                }

                animationStates = [];
            },
            animate: function animate(target, currentRect, toRect, duration) {
                if (duration) {
                    css(target, 'transition', '');
                    css(target, 'transform', '');
                    var elMatrix = matrix(this.el),
                        scaleX = elMatrix && elMatrix.a,
                        scaleY = elMatrix && elMatrix.d,
                        translateX = (currentRect.left - toRect.left) / (scaleX || 1),
                        translateY = (currentRect.top - toRect.top) / (scaleY || 1);
                    target.animatingX = !!translateX;
                    target.animatingY = !!translateY;
                    css(target, 'transform', 'translate3d(' + translateX + 'px,' + translateY + 'px,0)');
                    this.forRepaintDummy = repaint(target); // repaint

                    css(target, 'transition', 'transform ' + duration + 'ms' + (this.options.easing ? ' ' + this.options.easing : ''));
                    css(target, 'transform', 'translate3d(0,0,0)');
                    typeof target.animated === 'number' && clearTimeout(target.animated);
                    target.animated = setTimeout(function () {
                        css(target, 'transition', '');
                        css(target, 'transform', '');
                        target.animated = false;
                        target.animatingX = false;
                        target.animatingY = false;
                    }, duration);
                }
            }
        };
    }

    function repaint(target) {
        return target.offsetWidth;
    }

    function calculateRealTime(animatingRect, fromRect, toRect, options) {
        return Math.sqrt(Math.pow(fromRect.top - animatingRect.top, 2) + Math.pow(fromRect.left - animatingRect.left, 2)) / Math.sqrt(Math.pow(fromRect.top - toRect.top, 2) + Math.pow(fromRect.left - toRect.left, 2)) * options.animation;
    }

    var plugins = [];
    var defaults = {
        initializeByDefault: true
    };
    var PluginManager = {
        mount: function mount(plugin) {
            // Set default static properties
            for (var option in defaults) {
                if (defaults.hasOwnProperty(option) && !(option in plugin)) {
                    plugin[option] = defaults[option];
                }
            }

            plugins.forEach(function (p) {
                if (p.pluginName === plugin.pluginName) {
                    throw "Sortable: Cannot mount plugin ".concat(plugin.pluginName, " more than once");
                }
            });
            plugins.push(plugin);
        },
        pluginEvent: function pluginEvent(eventName, sortable, evt) {
            var _this = this;

            this.eventCanceled = false;

            evt.cancel = function () {
                _this.eventCanceled = true;
            };

            var eventNameGlobal = eventName + 'Global';
            plugins.forEach(function (plugin) {
                if (!sortable[plugin.pluginName]) return; // Fire global events if it exists in this sortable

                if (sortable[plugin.pluginName][eventNameGlobal]) {
                    sortable[plugin.pluginName][eventNameGlobal](_objectSpread2({
                        sortable: sortable
                    }, evt));
                } // Only fire plugin event if plugin is enabled in this sortable,
                // and plugin has event defined


                if (sortable.options[plugin.pluginName] && sortable[plugin.pluginName][eventName]) {
                    sortable[plugin.pluginName][eventName](_objectSpread2({
                        sortable: sortable
                    }, evt));
                }
            });
        },
        initializePlugins: function initializePlugins(sortable, el, defaults, options) {
            plugins.forEach(function (plugin) {
                var pluginName = plugin.pluginName;
                if (!sortable.options[pluginName] && !plugin.initializeByDefault) return;
                var initialized = new plugin(sortable, el, sortable.options);
                initialized.sortable = sortable;
                initialized.options = sortable.options;
                sortable[pluginName] = initialized; // Add default options from plugin

                _extends(defaults, initialized.defaults);
            });

            for (var option in sortable.options) {
                if (!sortable.options.hasOwnProperty(option)) continue;
                var modified = this.modifyOption(sortable, option, sortable.options[option]);

                if (typeof modified !== 'undefined') {
                    sortable.options[option] = modified;
                }
            }
        },
        getEventProperties: function getEventProperties(name, sortable) {
            var eventProperties = {};
            plugins.forEach(function (plugin) {
                if (typeof plugin.eventProperties !== 'function') return;

                _extends(eventProperties, plugin.eventProperties.call(sortable[plugin.pluginName], name));
            });
            return eventProperties;
        },
        modifyOption: function modifyOption(sortable, name, value) {
            var modifiedValue;
            plugins.forEach(function (plugin) {
                // Plugin must exist on the Sortable
                if (!sortable[plugin.pluginName]) return; // If static option listener exists for this option, call in the context of the Sortable's instance of this plugin

                if (plugin.optionListeners && typeof plugin.optionListeners[name] === 'function') {
                    modifiedValue = plugin.optionListeners[name].call(sortable[plugin.pluginName], value);
                }
            });
            return modifiedValue;
        }
    };

    function dispatchEvent(_ref) {
        var sortable = _ref.sortable,
            rootEl = _ref.rootEl,
            name = _ref.name,
            targetEl = _ref.targetEl,
            cloneEl = _ref.cloneEl,
            toEl = _ref.toEl,
            fromEl = _ref.fromEl,
            oldIndex = _ref.oldIndex,
            newIndex = _ref.newIndex,
            oldDraggableIndex = _ref.oldDraggableIndex,
            newDraggableIndex = _ref.newDraggableIndex,
            originalEvent = _ref.originalEvent,
            putSortable = _ref.putSortable,
            extraEventProperties = _ref.extraEventProperties;
        sortable = sortable || rootEl && rootEl[expando];
        if (!sortable) return;
        var evt,
            options = sortable.options,
            onName = 'on' + name.charAt(0).toUpperCase() + name.substr(1); // Support for new CustomEvent feature

        if (window.CustomEvent && !IE11OrLess && !Edge) {
            evt = new CustomEvent(name, {
                bubbles: true,
                cancelable: true
            });
        } else {
            evt = document.createEvent('Event');
            evt.initEvent(name, true, true);
        }

        evt.to = toEl || rootEl;
        evt.from = fromEl || rootEl;
        evt.item = targetEl || rootEl;
        evt.clone = cloneEl;
        evt.oldIndex = oldIndex;
        evt.newIndex = newIndex;
        evt.oldDraggableIndex = oldDraggableIndex;
        evt.newDraggableIndex = newDraggableIndex;
        evt.originalEvent = originalEvent;
        evt.pullMode = putSortable ? putSortable.lastPutMode : undefined;

        var allEventProperties = _objectSpread2(_objectSpread2({}, extraEventProperties), PluginManager.getEventProperties(name, sortable));

        for (var option in allEventProperties) {
            evt[option] = allEventProperties[option];
        }

        if (rootEl) {
            rootEl.dispatchEvent(evt);
        }

        if (options[onName]) {
            options[onName].call(sortable, evt);
        }
    }

    var _excluded = ["evt"];

    var pluginEvent = function pluginEvent(eventName, sortable) {
        var _ref = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : {},
            originalEvent = _ref.evt,
            data = _objectWithoutProperties(_ref, _excluded);

        PluginManager.pluginEvent.bind(Sortable)(eventName, sortable, _objectSpread2({
            dragEl: dragEl,
            parentEl: parentEl,
            ghostEl: ghostEl,
            rootEl: rootEl,
            nextEl: nextEl,
            lastDownEl: lastDownEl,
            cloneEl: cloneEl,
            cloneHidden: cloneHidden,
            dragStarted: moved,
            putSortable: putSortable,
            activeSortable: Sortable.active,
            originalEvent: originalEvent,
            oldIndex: oldIndex,
            oldDraggableIndex: oldDraggableIndex,
            newIndex: newIndex,
            newDraggableIndex: newDraggableIndex,
            hideGhostForTarget: _hideGhostForTarget,
            unhideGhostForTarget: _unhideGhostForTarget,
            cloneNowHidden: function cloneNowHidden() {
                cloneHidden = true;
            },
            cloneNowShown: function cloneNowShown() {
                cloneHidden = false;
            },
            dispatchSortableEvent: function dispatchSortableEvent(name) {
                _dispatchEvent({
                    sortable: sortable,
                    name: name,
                    originalEvent: originalEvent
                });
            }
        }, data));
    };

    function _dispatchEvent(info) {
        dispatchEvent(_objectSpread2({
            putSortable: putSortable,
            cloneEl: cloneEl,
            targetEl: dragEl,
            rootEl: rootEl,
            oldIndex: oldIndex,
            oldDraggableIndex: oldDraggableIndex,
            newIndex: newIndex,
            newDraggableIndex: newDraggableIndex
        }, info));
    }

    var dragEl,
        parentEl,
        ghostEl,
        rootEl,
        nextEl,
        lastDownEl,
        cloneEl,
        cloneHidden,
        oldIndex,
        newIndex,
        oldDraggableIndex,
        newDraggableIndex,
        activeGroup,
        putSortable,
        awaitingDragStarted = false,
        ignoreNextClick = false,
        sortables = [],
        tapEvt,
        touchEvt,
        lastDx,
        lastDy,
        tapDistanceLeft,
        tapDistanceTop,
        moved,
        lastTarget,
        lastDirection,
        pastFirstInvertThresh = false,
        isCircumstantialInvert = false,
        targetMoveDistance,
        // For positioning ghost absolutely
        ghostRelativeParent,
        ghostRelativeParentInitialScroll = [],
        // (left, top)
        _silent = false,
        savedInputChecked = [];
    /** @const */

    var documentExists = typeof document !== 'undefined',
        PositionGhostAbsolutely = IOS,
        CSSFloatProperty = Edge || IE11OrLess ? 'cssFloat' : 'float',
        // This will not pass for IE9, because IE9 DnD only works on anchors
        supportDraggable = documentExists && !ChromeForAndroid && !IOS && 'draggable' in document.createElement('div'),
        supportCssPointerEvents = function () {
            if (!documentExists) return; // false when <= IE11

            if (IE11OrLess) {
                return false;
            }

            var el = document.createElement('x');
            el.style.cssText = 'pointer-events:auto';
            return el.style.pointerEvents === 'auto';
        }(),
        _detectDirection = function _detectDirection(el, options) {
            var elCSS = css(el),
                elWidth = parseInt(elCSS.width) - parseInt(elCSS.paddingLeft) - parseInt(elCSS.paddingRight) - parseInt(elCSS.borderLeftWidth) - parseInt(elCSS.borderRightWidth),
                child1 = getChild(el, 0, options),
                child2 = getChild(el, 1, options),
                firstChildCSS = child1 && css(child1),
                secondChildCSS = child2 && css(child2),
                firstChildWidth = firstChildCSS && parseInt(firstChildCSS.marginLeft) + parseInt(firstChildCSS.marginRight) + getRect(child1).width,
                secondChildWidth = secondChildCSS && parseInt(secondChildCSS.marginLeft) + parseInt(secondChildCSS.marginRight) + getRect(child2).width;

            if (elCSS.display === 'flex') {
                return elCSS.flexDirection === 'column' || elCSS.flexDirection === 'column-reverse' ? 'vertical' : 'horizontal';
            }

            if (elCSS.display === 'grid') {
                return elCSS.gridTemplateColumns.split(' ').length <= 1 ? 'vertical' : 'horizontal';
            }

            if (child1 && firstChildCSS["float"] && firstChildCSS["float"] !== 'none') {
                var touchingSideChild2 = firstChildCSS["float"] === 'left' ? 'left' : 'right';
                return child2 && (secondChildCSS.clear === 'both' || secondChildCSS.clear === touchingSideChild2) ? 'vertical' : 'horizontal';
            }

            return child1 && (firstChildCSS.display === 'block' || firstChildCSS.display === 'flex' || firstChildCSS.display === 'table' || firstChildCSS.display === 'grid' || firstChildWidth >= elWidth && elCSS[CSSFloatProperty] === 'none' || child2 && elCSS[CSSFloatProperty] === 'none' && firstChildWidth + secondChildWidth > elWidth) ? 'vertical' : 'horizontal';
        },
        _dragElInRowColumn = function _dragElInRowColumn(dragRect, targetRect, vertical) {
            var dragElS1Opp = vertical ? dragRect.left : dragRect.top,
                dragElS2Opp = vertical ? dragRect.right : dragRect.bottom,
                dragElOppLength = vertical ? dragRect.width : dragRect.height,
                targetS1Opp = vertical ? targetRect.left : targetRect.top,
                targetS2Opp = vertical ? targetRect.right : targetRect.bottom,
                targetOppLength = vertical ? targetRect.width : targetRect.height;
            return dragElS1Opp === targetS1Opp || dragElS2Opp === targetS2Opp || dragElS1Opp + dragElOppLength / 2 === targetS1Opp + targetOppLength / 2;
        },

        /**
         * Detects first nearest empty sortable to X and Y position using emptyInsertThreshold.
         * @param  {Number} x      X position
         * @param  {Number} y      Y position
         * @return {HTMLElement}   Element of the first found nearest Sortable
         */
        _detectNearestEmptySortable = function _detectNearestEmptySortable(x, y) {
            var ret;
            sortables.some(function (sortable) {
                var threshold = sortable[expando].options.emptyInsertThreshold;
                if (!threshold || lastChild(sortable)) return;
                var rect = getRect(sortable),
                    insideHorizontally = x >= rect.left - threshold && x <= rect.right + threshold,
                    insideVertically = y >= rect.top - threshold && y <= rect.bottom + threshold;

                if (insideHorizontally && insideVertically) {
                    return ret = sortable;
                }
            });
            return ret;
        },
        _prepareGroup = function _prepareGroup(options) {
            function toFn(value, pull) {
                return function (to, from, dragEl, evt) {
                    var sameGroup = to.options.group.name && from.options.group.name && to.options.group.name === from.options.group.name;

                    if (value == null && (pull || sameGroup)) {
                        // Default pull value
                        // Default pull and put value if same group
                        return true;
                    } else if (value == null || value === false) {
                        return false;
                    } else if (pull && value === 'clone') {
                        return value;
                    } else if (typeof value === 'function') {
                        return toFn(value(to, from, dragEl, evt), pull)(to, from, dragEl, evt);
                    } else {
                        var otherGroup = (pull ? to : from).options.group.name;
                        return value === true || typeof value === 'string' && value === otherGroup || value.join && value.indexOf(otherGroup) > -1;
                    }
                };
            }

            var group = {};
            var originalGroup = options.group;

            if (!originalGroup || _typeof(originalGroup) != 'object') {
                originalGroup = {
                    name: originalGroup
                };
            }

            group.name = originalGroup.name;
            group.checkPull = toFn(originalGroup.pull, true);
            group.checkPut = toFn(originalGroup.put);
            group.revertClone = originalGroup.revertClone;
            options.group = group;
        },
        _hideGhostForTarget = function _hideGhostForTarget() {
            if (!supportCssPointerEvents && ghostEl) {
                css(ghostEl, 'display', 'none');
            }
        },
        _unhideGhostForTarget = function _unhideGhostForTarget() {
            if (!supportCssPointerEvents && ghostEl) {
                css(ghostEl, 'display', '');
            }
        }; // #1184 fix - Prevent click event on fallback if dragged but item not changed position


    if (documentExists && !ChromeForAndroid) {
        document.addEventListener('click', function (evt) {
            if (ignoreNextClick) {
                evt.preventDefault();
                evt.stopPropagation && evt.stopPropagation();
                evt.stopImmediatePropagation && evt.stopImmediatePropagation();
                ignoreNextClick = false;
                return false;
            }
        }, true);
    }

    var nearestEmptyInsertDetectEvent = function nearestEmptyInsertDetectEvent(evt) {
        if (dragEl) {
            evt = evt.touches ? evt.touches[0] : evt;

            var nearest = _detectNearestEmptySortable(evt.clientX, evt.clientY);

            if (nearest) {
                // Create imitation event
                var event = {};

                for (var i in evt) {
                    if (evt.hasOwnProperty(i)) {
                        event[i] = evt[i];
                    }
                }

                event.target = event.rootEl = nearest;
                event.preventDefault = void 0;
                event.stopPropagation = void 0;

                nearest[expando]._onDragOver(event);
            }
        }
    };

    var _checkOutsideTargetEl = function _checkOutsideTargetEl(evt) {
        if (dragEl) {
            dragEl.parentNode[expando]._isOutsideThisEl(evt.target);
        }
    };

    /**
     * @class  Sortable
     * @param  {HTMLElement}  el
     * @param  {Object}       [options]
     */


    function Sortable(el, options) {
        if (!(el && el.nodeType && el.nodeType === 1)) {
            throw "Sortable: `el` must be an HTMLElement, not ".concat({}.toString.call(el));
        }

        this.el = el; // root element

        this.options = options = _extends({}, options); // Export instance

        el[expando] = this;
        var defaults = {
            group: null,
            sort: true,
            disabled: false,
            store: null,
            handle: null,
            draggable: /^[uo]l$/i.test(el.nodeName) ? '>li' : '>*',
            swapThreshold: 1,
            // percentage; 0 <= x <= 1
            invertSwap: false,
            // invert always
            invertedSwapThreshold: null,
            // will be set to same as swapThreshold if default
            removeCloneOnHide: true,
            direction: function direction() {
                return _detectDirection(el, this.options);
            },
            ghostClass: 'sortable-ghost',
            chosenClass: 'sortable-chosen',
            dragClass: 'sortable-drag',
            ignore: 'a, img',
            filter: null,
            preventOnFilter: true,
            animation: 0,
            easing: null,
            setData: function setData(dataTransfer, dragEl) {
                dataTransfer.setData('Text', dragEl.textContent);
            },
            dropBubble: false,
            dragoverBubble: false,
            dataIdAttr: 'data-id',
            delay: 0,
            delayOnTouchOnly: false,
            touchStartThreshold: (Number.parseInt ? Number : window).parseInt(window.devicePixelRatio, 10) || 1,
            forceFallback: false,
            fallbackClass: 'sortable-fallback',
            fallbackOnBody: false,
            fallbackTolerance: 0,
            fallbackOffset: {
                x: 0,
                y: 0
            },
            supportPointer: Sortable.supportPointer !== false && 'PointerEvent' in window && !Safari,
            emptyInsertThreshold: 5
        };
        PluginManager.initializePlugins(this, el, defaults); // Set default options

        for (var name in defaults) {
            !(name in options) && (options[name] = defaults[name]);
        }

        _prepareGroup(options); // Bind all private methods


        for (var fn in this) {
            if (fn.charAt(0) === '_' && typeof this[fn] === 'function') {
                this[fn] = this[fn].bind(this);
            }
        } // Setup drag mode


        this.nativeDraggable = options.forceFallback ? false : supportDraggable;

        if (this.nativeDraggable) {
            // Touch start threshold cannot be greater than the native dragstart threshold
            this.options.touchStartThreshold = 1;
        } // Bind events


        if (options.supportPointer) {
            on(el, 'pointerdown', this._onTapStart);
        } else {
            on(el, 'mousedown', this._onTapStart);
            on(el, 'touchstart', this._onTapStart);
        }

        if (this.nativeDraggable) {
            on(el, 'dragover', this);
            on(el, 'dragenter', this);
        }

        sortables.push(this.el); // Restore sorting

        options.store && options.store.get && this.sort(options.store.get(this) || []); // Add animation state manager

        _extends(this, AnimationStateManager());
    }

    Sortable.prototype =
        /** @lends Sortable.prototype */
        {
            constructor: Sortable,
            _isOutsideThisEl: function _isOutsideThisEl(target) {
                if (!this.el.contains(target) && target !== this.el) {
                    lastTarget = null;
                }
            },
            _getDirection: function _getDirection(evt, target) {
                return typeof this.options.direction === 'function' ? this.options.direction.call(this, evt, target, dragEl) : this.options.direction;
            },
            _onTapStart: function _onTapStart(
                /** Event|TouchEvent */
                evt) {
                if (!evt.cancelable) return;

                var _this = this,
                    el = this.el,
                    options = this.options,
                    preventOnFilter = options.preventOnFilter,
                    type = evt.type,
                    touch = evt.touches && evt.touches[0] || evt.pointerType && evt.pointerType === 'touch' && evt,
                    target = (touch || evt).target,
                    originalTarget = evt.target.shadowRoot && (evt.path && evt.path[0] || evt.composedPath && evt.composedPath()[0]) || target,
                    filter = options.filter;

                _saveInputCheckedState(el); // Don't trigger start event when an element is been dragged, otherwise the evt.oldindex always wrong when set option.group.


                if (dragEl) {
                    return;
                }

                if (/mousedown|pointerdown/.test(type) && evt.button !== 0 || options.disabled) {
                    return; // only left button and enabled
                } // cancel dnd if original target is content editable


                if (originalTarget.isContentEditable) {
                    return;
                } // Safari ignores further event handling after mousedown


                if (!this.nativeDraggable && Safari && target && target.tagName.toUpperCase() === 'SELECT') {
                    return;
                }

                target = closest(target, options.draggable, el, false);

                if (target && target.animated) {
                    return;
                }

                if (lastDownEl === target) {
                    // Ignoring duplicate `down`
                    return;
                } // Get the index of the dragged element within its parent


                oldIndex = index(target);
                oldDraggableIndex = index(target, options.draggable); // Check filter

                if (typeof filter === 'function') {
                    if (filter.call(this, evt, target, this)) {
                        _dispatchEvent({
                            sortable: _this,
                            rootEl: originalTarget,
                            name: 'filter',
                            targetEl: target,
                            toEl: el,
                            fromEl: el
                        });

                        pluginEvent('filter', _this, {
                            evt: evt
                        });
                        preventOnFilter && evt.cancelable && evt.preventDefault();
                        return; // cancel dnd
                    }
                } else if (filter) {
                    filter = filter.split(',').some(function (criteria) {
                        criteria = closest(originalTarget, criteria.trim(), el, false);

                        if (criteria) {
                            _dispatchEvent({
                                sortable: _this,
                                rootEl: criteria,
                                name: 'filter',
                                targetEl: target,
                                fromEl: el,
                                toEl: el
                            });

                            pluginEvent('filter', _this, {
                                evt: evt
                            });
                            return true;
                        }
                    });

                    if (filter) {
                        preventOnFilter && evt.cancelable && evt.preventDefault();
                        return; // cancel dnd
                    }
                }

                if (options.handle && !closest(originalTarget, options.handle, el, false)) {
                    return;
                } // Prepare `dragstart`


                this._prepareDragStart(evt, touch, target);
            },
            _prepareDragStart: function _prepareDragStart(
                /** Event */
                evt,
                /** Touch */
                touch,
                /** HTMLElement */
                target) {
                var _this = this,
                    el = _this.el,
                    options = _this.options,
                    ownerDocument = el.ownerDocument,
                    dragStartFn;

                if (target && !dragEl && target.parentNode === el) {
                    var dragRect = getRect(target);
                    rootEl = el;
                    dragEl = target;
                    parentEl = dragEl.parentNode;
                    nextEl = dragEl.nextSibling;
                    lastDownEl = target;
                    activeGroup = options.group;
                    Sortable.dragged = dragEl;
                    tapEvt = {
                        target: dragEl,
                        clientX: (touch || evt).clientX,
                        clientY: (touch || evt).clientY
                    };
                    tapDistanceLeft = tapEvt.clientX - dragRect.left;
                    tapDistanceTop = tapEvt.clientY - dragRect.top;
                    this._lastX = (touch || evt).clientX;
                    this._lastY = (touch || evt).clientY;
                    dragEl.style['will-change'] = 'all';

                    dragStartFn = function dragStartFn() {
                        pluginEvent('delayEnded', _this, {
                            evt: evt
                        });

                        if (Sortable.eventCanceled) {
                            _this._onDrop();

                            return;
                        } // Delayed drag has been triggered
                        // we can re-enable the events: touchmove/mousemove


                        _this._disableDelayedDragEvents();

                        if (!FireFox && _this.nativeDraggable) {
                            dragEl.draggable = true;
                        } // Bind the events: dragstart/dragend


                        _this._triggerDragStart(evt, touch); // Drag start event


                        _dispatchEvent({
                            sortable: _this,
                            name: 'choose',
                            originalEvent: evt
                        }); // Chosen item


                        toggleClass(dragEl, options.chosenClass, true);
                    }; // Disable "draggable"


                    options.ignore.split(',').forEach(function (criteria) {
                        find(dragEl, criteria.trim(), _disableDraggable);
                    });
                    on(ownerDocument, 'dragover', nearestEmptyInsertDetectEvent);
                    on(ownerDocument, 'mousemove', nearestEmptyInsertDetectEvent);
                    on(ownerDocument, 'touchmove', nearestEmptyInsertDetectEvent);
                    on(ownerDocument, 'mouseup', _this._onDrop);
                    on(ownerDocument, 'touchend', _this._onDrop);
                    on(ownerDocument, 'touchcancel', _this._onDrop); // Make dragEl draggable (must be before delay for FireFox)

                    if (FireFox && this.nativeDraggable) {
                        this.options.touchStartThreshold = 4;
                        dragEl.draggable = true;
                    }

                    pluginEvent('delayStart', this, {
                        evt: evt
                    }); // Delay is impossible for native DnD in Edge or IE

                    if (options.delay && (!options.delayOnTouchOnly || touch) && (!this.nativeDraggable || !(Edge || IE11OrLess))) {
                        if (Sortable.eventCanceled) {
                            this._onDrop();

                            return;
                        } // If the user moves the pointer or let go the click or touch
                        // before the delay has been reached:
                        // disable the delayed drag


                        on(ownerDocument, 'mouseup', _this._disableDelayedDrag);
                        on(ownerDocument, 'touchend', _this._disableDelayedDrag);
                        on(ownerDocument, 'touchcancel', _this._disableDelayedDrag);
                        on(ownerDocument, 'mousemove', _this._delayedDragTouchMoveHandler);
                        on(ownerDocument, 'touchmove', _this._delayedDragTouchMoveHandler);
                        options.supportPointer && on(ownerDocument, 'pointermove', _this._delayedDragTouchMoveHandler);
                        _this._dragStartTimer = setTimeout(dragStartFn, options.delay);
                    } else {
                        dragStartFn();
                    }
                }
            },
            _delayedDragTouchMoveHandler: function _delayedDragTouchMoveHandler(
                /** TouchEvent|PointerEvent **/
                e) {
                var touch = e.touches ? e.touches[0] : e;

                if (Math.max(Math.abs(touch.clientX - this._lastX), Math.abs(touch.clientY - this._lastY)) >= Math.floor(this.options.touchStartThreshold / (this.nativeDraggable && window.devicePixelRatio || 1))) {
                    this._disableDelayedDrag();
                }
            },
            _disableDelayedDrag: function _disableDelayedDrag() {
                dragEl && _disableDraggable(dragEl);
                clearTimeout(this._dragStartTimer);

                this._disableDelayedDragEvents();
            },
            _disableDelayedDragEvents: function _disableDelayedDragEvents() {
                var ownerDocument = this.el.ownerDocument;
                off(ownerDocument, 'mouseup', this._disableDelayedDrag);
                off(ownerDocument, 'touchend', this._disableDelayedDrag);
                off(ownerDocument, 'touchcancel', this._disableDelayedDrag);
                off(ownerDocument, 'mousemove', this._delayedDragTouchMoveHandler);
                off(ownerDocument, 'touchmove', this._delayedDragTouchMoveHandler);
                off(ownerDocument, 'pointermove', this._delayedDragTouchMoveHandler);
            },
            _triggerDragStart: function _triggerDragStart(
                /** Event */
                evt,
                /** Touch */
                touch) {
                touch = touch || evt.pointerType == 'touch' && evt;

                if (!this.nativeDraggable || touch) {
                    if (this.options.supportPointer) {
                        on(document, 'pointermove', this._onTouchMove);
                    } else if (touch) {
                        on(document, 'touchmove', this._onTouchMove);
                    } else {
                        on(document, 'mousemove', this._onTouchMove);
                    }
                } else {
                    on(dragEl, 'dragend', this);
                    on(rootEl, 'dragstart', this._onDragStart);
                }

                try {
                    if (document.selection) {
                        // Timeout neccessary for IE9
                        _nextTick(function () {
                            document.selection.empty();
                        });
                    } else {
                        window.getSelection().removeAllRanges();
                    }
                } catch (err) {
                }
            },
            _dragStarted: function _dragStarted(fallback, evt) {

                awaitingDragStarted = false;

                if (rootEl && dragEl) {
                    pluginEvent('dragStarted', this, {
                        evt: evt
                    });

                    if (this.nativeDraggable) {
                        on(document, 'dragover', _checkOutsideTargetEl);
                    }

                    var options = this.options; // Apply effect

                    !fallback && toggleClass(dragEl, options.dragClass, false);
                    toggleClass(dragEl, options.ghostClass, true);
                    Sortable.active = this;
                    fallback && this._appendGhost(); // Drag start event

                    _dispatchEvent({
                        sortable: this,
                        name: 'start',
                        originalEvent: evt
                    });
                } else {
                    this._nulling();
                }
            },
            _emulateDragOver: function _emulateDragOver() {
                if (touchEvt) {
                    this._lastX = touchEvt.clientX;
                    this._lastY = touchEvt.clientY;

                    _hideGhostForTarget();

                    var target = document.elementFromPoint(touchEvt.clientX, touchEvt.clientY);
                    var parent = target;

                    while (target && target.shadowRoot) {
                        target = target.shadowRoot.elementFromPoint(touchEvt.clientX, touchEvt.clientY);
                        if (target === parent) break;
                        parent = target;
                    }

                    dragEl.parentNode[expando]._isOutsideThisEl(target);

                    if (parent) {
                        do {
                            if (parent[expando]) {
                                var inserted = void 0;
                                inserted = parent[expando]._onDragOver({
                                    clientX: touchEvt.clientX,
                                    clientY: touchEvt.clientY,
                                    target: target,
                                    rootEl: parent
                                });

                                if (inserted && !this.options.dragoverBubble) {
                                    break;
                                }
                            }

                            target = parent; // store last element
                        }
                            /* jshint boss:true */
                        while (parent = parent.parentNode);
                    }

                    _unhideGhostForTarget();
                }
            },
            _onTouchMove: function _onTouchMove(
                /**TouchEvent*/
                evt) {
                if (tapEvt) {
                    var options = this.options,
                        fallbackTolerance = options.fallbackTolerance,
                        fallbackOffset = options.fallbackOffset,
                        touch = evt.touches ? evt.touches[0] : evt,
                        ghostMatrix = ghostEl && matrix(ghostEl, true),
                        scaleX = ghostEl && ghostMatrix && ghostMatrix.a,
                        scaleY = ghostEl && ghostMatrix && ghostMatrix.d,
                        relativeScrollOffset = PositionGhostAbsolutely && ghostRelativeParent && getRelativeScrollOffset(ghostRelativeParent),
                        dx = (touch.clientX - tapEvt.clientX + fallbackOffset.x) / (scaleX || 1) + (relativeScrollOffset ? relativeScrollOffset[0] - ghostRelativeParentInitialScroll[0] : 0) / (scaleX || 1),
                        dy = (touch.clientY - tapEvt.clientY + fallbackOffset.y) / (scaleY || 1) + (relativeScrollOffset ? relativeScrollOffset[1] - ghostRelativeParentInitialScroll[1] : 0) / (scaleY || 1); // only set the status to dragging, when we are actually dragging

                    if (!Sortable.active && !awaitingDragStarted) {
                        if (fallbackTolerance && Math.max(Math.abs(touch.clientX - this._lastX), Math.abs(touch.clientY - this._lastY)) < fallbackTolerance) {
                            return;
                        }

                        this._onDragStart(evt, true);
                    }

                    if (ghostEl) {
                        if (ghostMatrix) {
                            ghostMatrix.e += dx - (lastDx || 0);
                            ghostMatrix.f += dy - (lastDy || 0);
                        } else {
                            ghostMatrix = {
                                a: 1,
                                b: 0,
                                c: 0,
                                d: 1,
                                e: dx,
                                f: dy
                            };
                        }

                        var cssMatrix = "matrix(".concat(ghostMatrix.a, ",").concat(ghostMatrix.b, ",").concat(ghostMatrix.c, ",").concat(ghostMatrix.d, ",").concat(ghostMatrix.e, ",").concat(ghostMatrix.f, ")");
                        css(ghostEl, 'webkitTransform', cssMatrix);
                        css(ghostEl, 'mozTransform', cssMatrix);
                        css(ghostEl, 'msTransform', cssMatrix);
                        css(ghostEl, 'transform', cssMatrix);
                        lastDx = dx;
                        lastDy = dy;
                        touchEvt = touch;
                    }

                    evt.cancelable && evt.preventDefault();
                }
            },
            _appendGhost: function _appendGhost() {
                // Bug if using scale(): https://stackoverflow.com/questions/2637058
                // Not being adjusted for
                if (!ghostEl) {
                    var container = this.options.fallbackOnBody ? document.body : rootEl,
                        rect = getRect(dragEl, true, PositionGhostAbsolutely, true, container),
                        options = this.options; // Position absolutely

                    if (PositionGhostAbsolutely) {
                        // Get relatively positioned parent
                        ghostRelativeParent = container;

                        while (css(ghostRelativeParent, 'position') === 'static' && css(ghostRelativeParent, 'transform') === 'none' && ghostRelativeParent !== document) {
                            ghostRelativeParent = ghostRelativeParent.parentNode;
                        }

                        if (ghostRelativeParent !== document.body && ghostRelativeParent !== document.documentElement) {
                            if (ghostRelativeParent === document) ghostRelativeParent = getWindowScrollingElement();
                            rect.top += ghostRelativeParent.scrollTop;
                            rect.left += ghostRelativeParent.scrollLeft;
                        } else {
                            ghostRelativeParent = getWindowScrollingElement();
                        }

                        ghostRelativeParentInitialScroll = getRelativeScrollOffset(ghostRelativeParent);
                    }

                    ghostEl = dragEl.cloneNode(true);
                    toggleClass(ghostEl, options.ghostClass, false);
                    toggleClass(ghostEl, options.fallbackClass, true);
                    toggleClass(ghostEl, options.dragClass, true);
                    css(ghostEl, 'transition', '');
                    css(ghostEl, 'transform', '');
                    css(ghostEl, 'box-sizing', 'border-box');
                    css(ghostEl, 'margin', 0);
                    css(ghostEl, 'top', rect.top);
                    css(ghostEl, 'left', rect.left);
                    css(ghostEl, 'width', rect.width);
                    css(ghostEl, 'height', rect.height);
                    css(ghostEl, 'opacity', '0.8');
                    css(ghostEl, 'position', PositionGhostAbsolutely ? 'absolute' : 'fixed');
                    css(ghostEl, 'zIndex', '100000');
                    css(ghostEl, 'pointerEvents', 'none');
                    Sortable.ghost = ghostEl;
                    container.appendChild(ghostEl); // Set transform-origin

                    css(ghostEl, 'transform-origin', tapDistanceLeft / parseInt(ghostEl.style.width) * 100 + '% ' + tapDistanceTop / parseInt(ghostEl.style.height) * 100 + '%');
                }
            },
            _onDragStart: function _onDragStart(
                /**Event*/
                evt,
                /**boolean*/
                fallback) {
                var _this = this;

                var dataTransfer = evt.dataTransfer;
                var options = _this.options;
                pluginEvent('dragStart', this, {
                    evt: evt
                });

                if (Sortable.eventCanceled) {
                    this._onDrop();

                    return;
                }

                pluginEvent('setupClone', this);

                if (!Sortable.eventCanceled) {
                    cloneEl = clone(dragEl);
                    cloneEl.removeAttribute("id");
                    cloneEl.draggable = false;
                    cloneEl.style['will-change'] = '';

                    this._hideClone();

                    toggleClass(cloneEl, this.options.chosenClass, false);
                    Sortable.clone = cloneEl;
                } // #1143: IFrame support workaround


                _this.cloneId = _nextTick(function () {
                    pluginEvent('clone', _this);
                    if (Sortable.eventCanceled) return;

                    if (!_this.options.removeCloneOnHide) {
                        rootEl.insertBefore(cloneEl, dragEl);
                    }

                    _this._hideClone();

                    _dispatchEvent({
                        sortable: _this,
                        name: 'clone'
                    });
                });
                !fallback && toggleClass(dragEl, options.dragClass, true); // Set proper drop events

                if (fallback) {
                    ignoreNextClick = true;
                    _this._loopId = setInterval(_this._emulateDragOver, 50);
                } else {
                    // Undo what was set in _prepareDragStart before drag started
                    off(document, 'mouseup', _this._onDrop);
                    off(document, 'touchend', _this._onDrop);
                    off(document, 'touchcancel', _this._onDrop);

                    if (dataTransfer) {
                        dataTransfer.effectAllowed = 'move';
                        options.setData && options.setData.call(_this, dataTransfer, dragEl);
                    }

                    on(document, 'drop', _this); // #1276 fix:

                    css(dragEl, 'transform', 'translateZ(0)');
                }

                awaitingDragStarted = true;
                _this._dragStartId = _nextTick(_this._dragStarted.bind(_this, fallback, evt));
                on(document, 'selectstart', _this);
                moved = true;

                if (Safari) {
                    css(document.body, 'user-select', 'none');
                }
            },
            // Returns true - if no further action is needed (either inserted or another condition)
            _onDragOver: function _onDragOver(
                /**Event*/
                evt) {
                var el = this.el,
                    target = evt.target,
                    dragRect,
                    targetRect,
                    revert,
                    options = this.options,
                    group = options.group,
                    activeSortable = Sortable.active,
                    isOwner = activeGroup === group,
                    canSort = options.sort,
                    fromSortable = putSortable || activeSortable,
                    vertical,
                    _this = this,
                    completedFired = false;

                if (_silent) return;

                function dragOverEvent(name, extra) {
                    pluginEvent(name, _this, _objectSpread2({
                        evt: evt,
                        isOwner: isOwner,
                        axis: vertical ? 'vertical' : 'horizontal',
                        revert: revert,
                        dragRect: dragRect,
                        targetRect: targetRect,
                        canSort: canSort,
                        fromSortable: fromSortable,
                        target: target,
                        completed: completed,
                        onMove: function onMove(target, after) {
                            return _onMove(rootEl, el, dragEl, dragRect, target, getRect(target), evt, after);
                        },
                        changed: changed
                    }, extra));
                } // Capture animation state


                function capture() {
                    dragOverEvent('dragOverAnimationCapture');

                    _this.captureAnimationState();

                    if (_this !== fromSortable) {
                        fromSortable.captureAnimationState();
                    }
                } // Return invocation when dragEl is inserted (or completed)


                function completed(insertion) {
                    dragOverEvent('dragOverCompleted', {
                        insertion: insertion
                    });

                    if (insertion) {
                        // Clones must be hidden before folding animation to capture dragRectAbsolute properly
                        if (isOwner) {
                            activeSortable._hideClone();
                        } else {
                            activeSortable._showClone(_this);
                        }

                        if (_this !== fromSortable) {
                            // Set ghost class to new sortable's ghost class
                            toggleClass(dragEl, putSortable ? putSortable.options.ghostClass : activeSortable.options.ghostClass, false);
                            toggleClass(dragEl, options.ghostClass, true);
                        }

                        if (putSortable !== _this && _this !== Sortable.active) {
                            putSortable = _this;
                        } else if (_this === Sortable.active && putSortable) {
                            putSortable = null;
                        } // Animation


                        if (fromSortable === _this) {
                            _this._ignoreWhileAnimating = target;
                        }

                        _this.animateAll(function () {
                            dragOverEvent('dragOverAnimationComplete');
                            _this._ignoreWhileAnimating = null;
                        });

                        if (_this !== fromSortable) {
                            fromSortable.animateAll();
                            fromSortable._ignoreWhileAnimating = null;
                        }
                    } // Null lastTarget if it is not inside a previously swapped element


                    if (target === dragEl && !dragEl.animated || target === el && !target.animated) {
                        lastTarget = null;
                    } // no bubbling and not fallback


                    if (!options.dragoverBubble && !evt.rootEl && target !== document) {
                        dragEl.parentNode[expando]._isOutsideThisEl(evt.target); // Do not detect for empty insert if already inserted


                        !insertion && nearestEmptyInsertDetectEvent(evt);
                    }

                    !options.dragoverBubble && evt.stopPropagation && evt.stopPropagation();
                    return completedFired = true;
                } // Call when dragEl has been inserted


                function changed() {
                    newIndex = index(dragEl);
                    newDraggableIndex = index(dragEl, options.draggable);

                    _dispatchEvent({
                        sortable: _this,
                        name: 'change',
                        toEl: el,
                        newIndex: newIndex,
                        newDraggableIndex: newDraggableIndex,
                        originalEvent: evt
                    });
                }

                if (evt.preventDefault !== void 0) {
                    evt.cancelable && evt.preventDefault();
                }

                target = closest(target, options.draggable, el, true);
                dragOverEvent('dragOver');
                if (Sortable.eventCanceled) return completedFired;

                if (dragEl.contains(evt.target) || target.animated && target.animatingX && target.animatingY || _this._ignoreWhileAnimating === target) {
                    return completed(false);
                }

                ignoreNextClick = false;

                if (activeSortable && !options.disabled && (isOwner ? canSort || (revert = parentEl !== rootEl) // Reverting item into the original list
                    : putSortable === this || (this.lastPutMode = activeGroup.checkPull(this, activeSortable, dragEl, evt)) && group.checkPut(this, activeSortable, dragEl, evt))) {
                    vertical = this._getDirection(evt, target) === 'vertical';
                    dragRect = getRect(dragEl);
                    dragOverEvent('dragOverValid');
                    if (Sortable.eventCanceled) return completedFired;

                    if (revert) {
                        parentEl = rootEl; // actualization

                        capture();

                        this._hideClone();

                        dragOverEvent('revert');

                        if (!Sortable.eventCanceled) {
                            if (nextEl) {
                                rootEl.insertBefore(dragEl, nextEl);
                            } else {
                                rootEl.appendChild(dragEl);
                            }
                        }

                        return completed(true);
                    }

                    var elLastChild = lastChild(el, options.draggable);

                    if (!elLastChild || _ghostIsLast(evt, vertical, this) && !elLastChild.animated) {
                        // Insert to end of list
                        // If already at end of list: Do not insert
                        if (elLastChild === dragEl) {
                            return completed(false);
                        } // if there is a last element, it is the target


                        if (elLastChild && el === evt.target) {
                            target = elLastChild;
                        }

                        if (target) {
                            targetRect = getRect(target);
                        }

                        if (_onMove(rootEl, el, dragEl, dragRect, target, targetRect, evt, !!target) !== false) {
                            capture();

                            if (elLastChild && elLastChild.nextSibling) {
                                // the last draggable element is not the last node
                                el.insertBefore(dragEl, elLastChild.nextSibling);
                            } else {
                                el.appendChild(dragEl);
                            }

                            parentEl = el; // actualization

                            changed();
                            return completed(true);
                        }
                    } else if (elLastChild && _ghostIsFirst(evt, vertical, this)) {
                        // Insert to start of list
                        var firstChild = getChild(el, 0, options, true);

                        if (firstChild === dragEl) {
                            return completed(false);
                        }

                        target = firstChild;
                        targetRect = getRect(target);

                        if (_onMove(rootEl, el, dragEl, dragRect, target, targetRect, evt, false) !== false) {
                            capture();
                            el.insertBefore(dragEl, firstChild);
                            parentEl = el; // actualization

                            changed();
                            return completed(true);
                        }
                    } else if (target.parentNode === el) {
                        targetRect = getRect(target);
                        var direction = 0,
                            targetBeforeFirstSwap,
                            differentLevel = dragEl.parentNode !== el,
                            differentRowCol = !_dragElInRowColumn(dragEl.animated && dragEl.toRect || dragRect, target.animated && target.toRect || targetRect, vertical),
                            side1 = vertical ? 'top' : 'left',
                            scrolledPastTop = isScrolledPast(target, 'top', 'top') || isScrolledPast(dragEl, 'top', 'top'),
                            scrollBefore = scrolledPastTop ? scrolledPastTop.scrollTop : void 0;

                        if (lastTarget !== target) {
                            targetBeforeFirstSwap = targetRect[side1];
                            pastFirstInvertThresh = false;
                            isCircumstantialInvert = !differentRowCol && options.invertSwap || differentLevel;
                        }

                        direction = _getSwapDirection(evt, target, targetRect, vertical, differentRowCol ? 1 : options.swapThreshold, options.invertedSwapThreshold == null ? options.swapThreshold : options.invertedSwapThreshold, isCircumstantialInvert, lastTarget === target);
                        var sibling;

                        if (direction !== 0) {
                            // Check if target is beside dragEl in respective direction (ignoring hidden elements)
                            var dragIndex = index(dragEl);

                            do {
                                dragIndex -= direction;
                                sibling = parentEl.children[dragIndex];
                            } while (sibling && (css(sibling, 'display') === 'none' || sibling === ghostEl));
                        } // If dragEl is already beside target: Do not insert


                        if (direction === 0 || sibling === target) {
                            return completed(false);
                        }

                        lastTarget = target;
                        lastDirection = direction;
                        var nextSibling = target.nextElementSibling,
                            after = false;
                        after = direction === 1;

                        var moveVector = _onMove(rootEl, el, dragEl, dragRect, target, targetRect, evt, after);

                        if (moveVector !== false) {
                            if (moveVector === 1 || moveVector === -1) {
                                after = moveVector === 1;
                            }

                            _silent = true;
                            setTimeout(_unsilent, 30);
                            capture();

                            if (after && !nextSibling) {
                                el.appendChild(dragEl);
                            } else {
                                target.parentNode.insertBefore(dragEl, after ? nextSibling : target);
                            } // Undo chrome's scroll adjustment (has no effect on other browsers)


                            if (scrolledPastTop) {
                                scrollBy(scrolledPastTop, 0, scrollBefore - scrolledPastTop.scrollTop);
                            }

                            parentEl = dragEl.parentNode; // actualization
                            // must be done before animation

                            if (targetBeforeFirstSwap !== undefined && !isCircumstantialInvert) {
                                targetMoveDistance = Math.abs(targetBeforeFirstSwap - getRect(target)[side1]);
                            }

                            changed();
                            return completed(true);
                        }
                    }

                    if (el.contains(dragEl)) {
                        return completed(false);
                    }
                }

                return false;
            },
            _ignoreWhileAnimating: null,
            _offMoveEvents: function _offMoveEvents() {
                off(document, 'mousemove', this._onTouchMove);
                off(document, 'touchmove', this._onTouchMove);
                off(document, 'pointermove', this._onTouchMove);
                off(document, 'dragover', nearestEmptyInsertDetectEvent);
                off(document, 'mousemove', nearestEmptyInsertDetectEvent);
                off(document, 'touchmove', nearestEmptyInsertDetectEvent);
            },
            _offUpEvents: function _offUpEvents() {
                var ownerDocument = this.el.ownerDocument;
                off(ownerDocument, 'mouseup', this._onDrop);
                off(ownerDocument, 'touchend', this._onDrop);
                off(ownerDocument, 'pointerup', this._onDrop);
                off(ownerDocument, 'touchcancel', this._onDrop);
                off(document, 'selectstart', this);
            },
            _onDrop: function _onDrop(
                /**Event*/
                evt) {
                var el = this.el,
                    options = this.options; // Get the index of the dragged element within its parent

                newIndex = index(dragEl);
                newDraggableIndex = index(dragEl, options.draggable);
                pluginEvent('drop', this, {
                    evt: evt
                });
                parentEl = dragEl && dragEl.parentNode; // Get again after plugin event

                newIndex = index(dragEl);
                newDraggableIndex = index(dragEl, options.draggable);

                if (Sortable.eventCanceled) {
                    this._nulling();

                    return;
                }

                awaitingDragStarted = false;
                isCircumstantialInvert = false;
                pastFirstInvertThresh = false;
                clearInterval(this._loopId);
                clearTimeout(this._dragStartTimer);

                _cancelNextTick(this.cloneId);

                _cancelNextTick(this._dragStartId); // Unbind events


                if (this.nativeDraggable) {
                    off(document, 'drop', this);
                    off(el, 'dragstart', this._onDragStart);
                }

                this._offMoveEvents();

                this._offUpEvents();

                if (Safari) {
                    css(document.body, 'user-select', '');
                }

                css(dragEl, 'transform', '');

                if (evt) {
                    if (moved) {
                        evt.cancelable && evt.preventDefault();
                        !options.dropBubble && evt.stopPropagation();
                    }

                    ghostEl && ghostEl.parentNode && ghostEl.parentNode.removeChild(ghostEl);

                    if (rootEl === parentEl || putSortable && putSortable.lastPutMode !== 'clone') {
                        // Remove clone(s)
                        cloneEl && cloneEl.parentNode && cloneEl.parentNode.removeChild(cloneEl);
                    }

                    if (dragEl) {
                        if (this.nativeDraggable) {
                            off(dragEl, 'dragend', this);
                        }

                        _disableDraggable(dragEl);

                        dragEl.style['will-change'] = ''; // Remove classes
                        // ghostClass is added in dragStarted

                        if (moved && !awaitingDragStarted) {
                            toggleClass(dragEl, putSortable ? putSortable.options.ghostClass : this.options.ghostClass, false);
                        }

                        toggleClass(dragEl, this.options.chosenClass, false); // Drag stop event

                        _dispatchEvent({
                            sortable: this,
                            name: 'unchoose',
                            toEl: parentEl,
                            newIndex: null,
                            newDraggableIndex: null,
                            originalEvent: evt
                        });

                        if (rootEl !== parentEl) {
                            if (newIndex >= 0) {
                                // Add event
                                _dispatchEvent({
                                    rootEl: parentEl,
                                    name: 'add',
                                    toEl: parentEl,
                                    fromEl: rootEl,
                                    originalEvent: evt
                                }); // Remove event


                                _dispatchEvent({
                                    sortable: this,
                                    name: 'remove',
                                    toEl: parentEl,
                                    originalEvent: evt
                                }); // drag from one list and drop into another


                                _dispatchEvent({
                                    rootEl: parentEl,
                                    name: 'sort',
                                    toEl: parentEl,
                                    fromEl: rootEl,
                                    originalEvent: evt
                                });

                                _dispatchEvent({
                                    sortable: this,
                                    name: 'sort',
                                    toEl: parentEl,
                                    originalEvent: evt
                                });
                            }

                            putSortable && putSortable.save();
                        } else {
                            if (newIndex !== oldIndex) {
                                if (newIndex >= 0) {
                                    // drag & drop within the same list
                                    _dispatchEvent({
                                        sortable: this,
                                        name: 'update',
                                        toEl: parentEl,
                                        originalEvent: evt
                                    });

                                    _dispatchEvent({
                                        sortable: this,
                                        name: 'sort',
                                        toEl: parentEl,
                                        originalEvent: evt
                                    });
                                }
                            }
                        }

                        if (Sortable.active) {
                            /* jshint eqnull:true */
                            if (newIndex == null || newIndex === -1) {
                                newIndex = oldIndex;
                                newDraggableIndex = oldDraggableIndex;
                            }

                            _dispatchEvent({
                                sortable: this,
                                name: 'end',
                                toEl: parentEl,
                                originalEvent: evt
                            }); // Save sorting


                            this.save();
                        }
                    }
                }

                this._nulling();
            },
            _nulling: function _nulling() {
                pluginEvent('nulling', this);
                rootEl = dragEl = parentEl = ghostEl = nextEl = cloneEl = lastDownEl = cloneHidden = tapEvt = touchEvt = moved = newIndex = newDraggableIndex = oldIndex = oldDraggableIndex = lastTarget = lastDirection = putSortable = activeGroup = Sortable.dragged = Sortable.ghost = Sortable.clone = Sortable.active = null;
                savedInputChecked.forEach(function (el) {
                    el.checked = true;
                });
                savedInputChecked.length = lastDx = lastDy = 0;
            },
            handleEvent: function handleEvent(
                /**Event*/
                evt) {
                switch (evt.type) {
                    case 'drop':
                    case 'dragend':
                        this._onDrop(evt);

                        break;

                    case 'dragenter':
                    case 'dragover':
                        if (dragEl) {
                            this._onDragOver(evt);

                            _globalDragOver(evt);
                        }

                        break;

                    case 'selectstart':
                        evt.preventDefault();
                        break;
                }
            },

            /**
             * Serializes the item into an array of string.
             * @returns {String[]}
             */
            toArray: function toArray() {
                var order = [],
                    el,
                    children = this.el.children,
                    i = 0,
                    n = children.length,
                    options = this.options;

                for (; i < n; i++) {
                    el = children[i];

                    if (closest(el, options.draggable, this.el, false)) {
                        order.push(el.getAttribute(options.dataIdAttr) || _generateId(el));
                    }
                }

                return order;
            },

            /**
             * Sorts the elements according to the array.
             * @param  {String[]}  order  order of the items
             */
            sort: function sort(order, useAnimation) {
                var items = {},
                    rootEl = this.el;
                this.toArray().forEach(function (id, i) {
                    var el = rootEl.children[i];

                    if (closest(el, this.options.draggable, rootEl, false)) {
                        items[id] = el;
                    }
                }, this);
                useAnimation && this.captureAnimationState();
                order.forEach(function (id) {
                    if (items[id]) {
                        rootEl.removeChild(items[id]);
                        rootEl.appendChild(items[id]);
                    }
                });
                useAnimation && this.animateAll();
            },

            /**
             * Save the current sorting
             */
            save: function save() {
                var store = this.options.store;
                store && store.set && store.set(this);
            },

            /**
             * For each element in the set, get the first element that matches the selector by testing the element itself and traversing up through its ancestors in the DOM tree.
             * @param   {HTMLElement}  el
             * @param   {String}       [selector]  default: `options.draggable`
             * @returns {HTMLElement|null}
             */
            closest: function closest$1(el, selector) {
                return closest(el, selector || this.options.draggable, this.el, false);
            },

            /**
             * Set/get option
             * @param   {string} name
             * @param   {*}      [value]
             * @returns {*}
             */
            option: function option(name, value) {
                var options = this.options;

                if (value === void 0) {
                    return options[name];
                } else {
                    var modifiedValue = PluginManager.modifyOption(this, name, value);

                    if (typeof modifiedValue !== 'undefined') {
                        options[name] = modifiedValue;
                    } else {
                        options[name] = value;
                    }

                    if (name === 'group') {
                        _prepareGroup(options);
                    }
                }
            },

            /**
             * Destroy
             */
            destroy: function destroy() {
                pluginEvent('destroy', this);
                var el = this.el;
                el[expando] = null;
                off(el, 'mousedown', this._onTapStart);
                off(el, 'touchstart', this._onTapStart);
                off(el, 'pointerdown', this._onTapStart);

                if (this.nativeDraggable) {
                    off(el, 'dragover', this);
                    off(el, 'dragenter', this);
                } // Remove draggable attributes


                Array.prototype.forEach.call(el.querySelectorAll('[draggable]'), function (el) {
                    el.removeAttribute('draggable');
                });

                this._onDrop();

                this._disableDelayedDragEvents();

                sortables.splice(sortables.indexOf(this.el), 1);
                this.el = el = null;
            },
            _hideClone: function _hideClone() {
                if (!cloneHidden) {
                    pluginEvent('hideClone', this);
                    if (Sortable.eventCanceled) return;
                    css(cloneEl, 'display', 'none');

                    if (this.options.removeCloneOnHide && cloneEl.parentNode) {
                        cloneEl.parentNode.removeChild(cloneEl);
                    }

                    cloneHidden = true;
                }
            },
            _showClone: function _showClone(putSortable) {
                if (putSortable.lastPutMode !== 'clone') {
                    this._hideClone();

                    return;
                }

                if (cloneHidden) {
                    pluginEvent('showClone', this);
                    if (Sortable.eventCanceled) return; // show clone at dragEl or original position

                    if (dragEl.parentNode == rootEl && !this.options.group.revertClone) {
                        rootEl.insertBefore(cloneEl, dragEl);
                    } else if (nextEl) {
                        rootEl.insertBefore(cloneEl, nextEl);
                    } else {
                        rootEl.appendChild(cloneEl);
                    }

                    if (this.options.group.revertClone) {
                        this.animate(dragEl, cloneEl);
                    }

                    css(cloneEl, 'display', '');
                    cloneHidden = false;
                }
            }
        };

    function _globalDragOver(
        /**Event*/
        evt) {
        if (evt.dataTransfer) {
            evt.dataTransfer.dropEffect = 'move';
        }

        evt.cancelable && evt.preventDefault();
    }

    function _onMove(fromEl, toEl, dragEl, dragRect, targetEl, targetRect, originalEvent, willInsertAfter) {
        var evt,
            sortable = fromEl[expando],
            onMoveFn = sortable.options.onMove,
            retVal; // Support for new CustomEvent feature

        if (window.CustomEvent && !IE11OrLess && !Edge) {
            evt = new CustomEvent('move', {
                bubbles: true,
                cancelable: true
            });
        } else {
            evt = document.createEvent('Event');
            evt.initEvent('move', true, true);
        }

        evt.to = toEl;
        evt.from = fromEl;
        evt.dragged = dragEl;
        evt.draggedRect = dragRect;
        evt.related = targetEl || toEl;
        evt.relatedRect = targetRect || getRect(toEl);
        evt.willInsertAfter = willInsertAfter;
        evt.originalEvent = originalEvent;
        fromEl.dispatchEvent(evt);

        if (onMoveFn) {
            retVal = onMoveFn.call(sortable, evt, originalEvent);
        }

        return retVal;
    }

    function _disableDraggable(el) {
        el.draggable = false;
    }

    function _unsilent() {
        _silent = false;
    }

    function _ghostIsFirst(evt, vertical, sortable) {
        var rect = getRect(getChild(sortable.el, 0, sortable.options, true));
        var spacer = 10;
        return vertical ? evt.clientX < rect.left - spacer || evt.clientY < rect.top && evt.clientX < rect.right : evt.clientY < rect.top - spacer || evt.clientY < rect.bottom && evt.clientX < rect.left;
    }

    function _ghostIsLast(evt, vertical, sortable) {
        var rect = getRect(lastChild(sortable.el, sortable.options.draggable));
        var spacer = 10;
        return vertical ? evt.clientX > rect.right + spacer || evt.clientX <= rect.right && evt.clientY > rect.bottom && evt.clientX >= rect.left : evt.clientX > rect.right && evt.clientY > rect.top || evt.clientX <= rect.right && evt.clientY > rect.bottom + spacer;
    }

    function _getSwapDirection(evt, target, targetRect, vertical, swapThreshold, invertedSwapThreshold, invertSwap, isLastTarget) {
        var mouseOnAxis = vertical ? evt.clientY : evt.clientX,
            targetLength = vertical ? targetRect.height : targetRect.width,
            targetS1 = vertical ? targetRect.top : targetRect.left,
            targetS2 = vertical ? targetRect.bottom : targetRect.right,
            invert = false;

        if (!invertSwap) {
            // Never invert or create dragEl shadow when target movemenet causes mouse to move past the end of regular swapThreshold
            if (isLastTarget && targetMoveDistance < targetLength * swapThreshold) {
                // multiplied only by swapThreshold because mouse will already be inside target by (1 - threshold) * targetLength / 2
                // check if past first invert threshold on side opposite of lastDirection
                if (!pastFirstInvertThresh && (lastDirection === 1 ? mouseOnAxis > targetS1 + targetLength * invertedSwapThreshold / 2 : mouseOnAxis < targetS2 - targetLength * invertedSwapThreshold / 2)) {
                    // past first invert threshold, do not restrict inverted threshold to dragEl shadow
                    pastFirstInvertThresh = true;
                }

                if (!pastFirstInvertThresh) {
                    // dragEl shadow (target move distance shadow)
                    if (lastDirection === 1 ? mouseOnAxis < targetS1 + targetMoveDistance // over dragEl shadow
                        : mouseOnAxis > targetS2 - targetMoveDistance) {
                        return -lastDirection;
                    }
                } else {
                    invert = true;
                }
            } else {
                // Regular
                if (mouseOnAxis > targetS1 + targetLength * (1 - swapThreshold) / 2 && mouseOnAxis < targetS2 - targetLength * (1 - swapThreshold) / 2) {
                    return _getInsertDirection(target);
                }
            }
        }

        invert = invert || invertSwap;

        if (invert) {
            // Invert of regular
            if (mouseOnAxis < targetS1 + targetLength * invertedSwapThreshold / 2 || mouseOnAxis > targetS2 - targetLength * invertedSwapThreshold / 2) {
                return mouseOnAxis > targetS1 + targetLength / 2 ? 1 : -1;
            }
        }

        return 0;
    }

    /**
     * Gets the direction dragEl must be swapped relative to target in order to make it
     * seem that dragEl has been "inserted" into that element's position
     * @param  {HTMLElement} target       The target whose position dragEl is being inserted at
     * @return {Number}                   Direction dragEl must be swapped
     */


    function _getInsertDirection(target) {
        if (index(dragEl) < index(target)) {
            return 1;
        } else {
            return -1;
        }
    }

    /**
     * Generate id
     * @param   {HTMLElement} el
     * @returns {String}
     * @private
     */


    function _generateId(el) {
        var str = el.tagName + el.className + el.src + el.href + el.textContent,
            i = str.length,
            sum = 0;

        while (i--) {
            sum += str.charCodeAt(i);
        }

        return sum.toString(36);
    }

    function _saveInputCheckedState(root) {
        savedInputChecked.length = 0;
        var inputs = root.getElementsByTagName('input');
        var idx = inputs.length;

        while (idx--) {
            var el = inputs[idx];
            el.checked && savedInputChecked.push(el);
        }
    }

    function _nextTick(fn) {
        return setTimeout(fn, 0);
    }

    function _cancelNextTick(id) {
        return clearTimeout(id);
    } // Fixed #973:


    if (documentExists) {
        on(document, 'touchmove', function (evt) {
            if ((Sortable.active || awaitingDragStarted) && evt.cancelable) {
                evt.preventDefault();
            }
        });
    } // Export utils


    Sortable.utils = {
        on: on,
        off: off,
        css: css,
        find: find,
        is: function is(el, selector) {
            return !!closest(el, selector, el, false);
        },
        extend: extend,
        throttle: throttle,
        closest: closest,
        toggleClass: toggleClass,
        clone: clone,
        index: index,
        nextTick: _nextTick,
        cancelNextTick: _cancelNextTick,
        detectDirection: _detectDirection,
        getChild: getChild
    };
    /**
     * Get the Sortable instance of an element
     * @param  {HTMLElement} element The element
     * @return {Sortable|undefined}         The instance of Sortable
     */

    Sortable.get = function (element) {
        return element[expando];
    };
    /**
     * Mount a plugin to Sortable
     * @param  {...SortablePlugin|SortablePlugin[]} plugins       Plugins being mounted
     */


    Sortable.mount = function () {
        for (var _len = arguments.length, plugins = new Array(_len), _key = 0; _key < _len; _key++) {
            plugins[_key] = arguments[_key];
        }

        if (plugins[0].constructor === Array) plugins = plugins[0];
        plugins.forEach(function (plugin) {
            if (!plugin.prototype || !plugin.prototype.constructor) {
                throw "Sortable: Mounted plugin must be a constructor function, not ".concat({}.toString.call(plugin));
            }

            if (plugin.utils) Sortable.utils = _objectSpread2(_objectSpread2({}, Sortable.utils), plugin.utils);
            PluginManager.mount(plugin);
        });
    };
    /**
     * Create sortable instance
     * @param {HTMLElement}  el
     * @param {Object}      [options]
     */


    Sortable.create = function (el, options) {
        return new Sortable(el, options);
    }; // Export


    Sortable.version = version;

    var autoScrolls = [],
        scrollEl,
        scrollRootEl,
        scrolling = false,
        lastAutoScrollX,
        lastAutoScrollY,
        touchEvt$1,
        pointerElemChangedInterval;

    function AutoScrollPlugin() {
        function AutoScroll() {
            this.defaults = {
                scroll: true,
                forceAutoScrollFallback: false,
                scrollSensitivity: 30,
                scrollSpeed: 10,
                bubbleScroll: true
            }; // Bind all private methods

            for (var fn in this) {
                if (fn.charAt(0) === '_' && typeof this[fn] === 'function') {
                    this[fn] = this[fn].bind(this);
                }
            }
        }

        AutoScroll.prototype = {
            dragStarted: function dragStarted(_ref) {
                var originalEvent = _ref.originalEvent;

                if (this.sortable.nativeDraggable) {
                    on(document, 'dragover', this._handleAutoScroll);
                } else {
                    if (this.options.supportPointer) {
                        on(document, 'pointermove', this._handleFallbackAutoScroll);
                    } else if (originalEvent.touches) {
                        on(document, 'touchmove', this._handleFallbackAutoScroll);
                    } else {
                        on(document, 'mousemove', this._handleFallbackAutoScroll);
                    }
                }
            },
            dragOverCompleted: function dragOverCompleted(_ref2) {
                var originalEvent = _ref2.originalEvent;

                // For when bubbling is canceled and using fallback (fallback 'touchmove' always reached)
                if (!this.options.dragOverBubble && !originalEvent.rootEl) {
                    this._handleAutoScroll(originalEvent);
                }
            },
            drop: function drop() {
                if (this.sortable.nativeDraggable) {
                    off(document, 'dragover', this._handleAutoScroll);
                } else {
                    off(document, 'pointermove', this._handleFallbackAutoScroll);
                    off(document, 'touchmove', this._handleFallbackAutoScroll);
                    off(document, 'mousemove', this._handleFallbackAutoScroll);
                }

                clearPointerElemChangedInterval();
                clearAutoScrolls();
                cancelThrottle();
            },
            nulling: function nulling() {
                touchEvt$1 = scrollRootEl = scrollEl = scrolling = pointerElemChangedInterval = lastAutoScrollX = lastAutoScrollY = null;
                autoScrolls.length = 0;
            },
            _handleFallbackAutoScroll: function _handleFallbackAutoScroll(evt) {
                this._handleAutoScroll(evt, true);
            },
            _handleAutoScroll: function _handleAutoScroll(evt, fallback) {
                var _this = this;

                var x = (evt.touches ? evt.touches[0] : evt).clientX,
                    y = (evt.touches ? evt.touches[0] : evt).clientY,
                    elem = document.elementFromPoint(x, y);
                touchEvt$1 = evt; // IE does not seem to have native autoscroll,
                // Edge's autoscroll seems too conditional,
                // MACOS Safari does not have autoscroll,
                // Firefox and Chrome are good

                if (fallback || this.options.forceAutoScrollFallback || Edge || IE11OrLess || Safari) {
                    autoScroll(evt, this.options, elem, fallback); // Listener for pointer element change

                    var ogElemScroller = getParentAutoScrollElement(elem, true);

                    if (scrolling && (!pointerElemChangedInterval || x !== lastAutoScrollX || y !== lastAutoScrollY)) {
                        pointerElemChangedInterval && clearPointerElemChangedInterval(); // Detect for pointer elem change, emulating native DnD behaviour

                        pointerElemChangedInterval = setInterval(function () {
                            var newElem = getParentAutoScrollElement(document.elementFromPoint(x, y), true);

                            if (newElem !== ogElemScroller) {
                                ogElemScroller = newElem;
                                clearAutoScrolls();
                            }

                            autoScroll(evt, _this.options, newElem, fallback);
                        }, 10);
                        lastAutoScrollX = x;
                        lastAutoScrollY = y;
                    }
                } else {
                    // if DnD is enabled (and browser has good autoscrolling), first autoscroll will already scroll, so get parent autoscroll of first autoscroll
                    if (!this.options.bubbleScroll || getParentAutoScrollElement(elem, true) === getWindowScrollingElement()) {
                        clearAutoScrolls();
                        return;
                    }

                    autoScroll(evt, this.options, getParentAutoScrollElement(elem, false), false);
                }
            }
        };
        return _extends(AutoScroll, {
            pluginName: 'scroll',
            initializeByDefault: true
        });
    }

    function clearAutoScrolls() {
        autoScrolls.forEach(function (autoScroll) {
            clearInterval(autoScroll.pid);
        });
        autoScrolls = [];
    }

    function clearPointerElemChangedInterval() {
        clearInterval(pointerElemChangedInterval);
    }

    var autoScroll = throttle(function (evt, options, rootEl, isFallback) {
        // Bug: https://bugzilla.mozilla.org/show_bug.cgi?id=505521
        if (!options.scroll) return;
        var x = (evt.touches ? evt.touches[0] : evt).clientX,
            y = (evt.touches ? evt.touches[0] : evt).clientY,
            sens = options.scrollSensitivity,
            speed = options.scrollSpeed,
            winScroller = getWindowScrollingElement();
        var scrollThisInstance = false,
            scrollCustomFn; // New scroll root, set scrollEl

        if (scrollRootEl !== rootEl) {
            scrollRootEl = rootEl;
            clearAutoScrolls();
            scrollEl = options.scroll;
            scrollCustomFn = options.scrollFn;

            if (scrollEl === true) {
                scrollEl = getParentAutoScrollElement(rootEl, true);
            }
        }

        var layersOut = 0;
        var currentParent = scrollEl;

        do {
            var el = currentParent,
                rect = getRect(el),
                top = rect.top,
                bottom = rect.bottom,
                left = rect.left,
                right = rect.right,
                width = rect.width,
                height = rect.height,
                canScrollX = void 0,
                canScrollY = void 0,
                scrollWidth = el.scrollWidth,
                scrollHeight = el.scrollHeight,
                elCSS = css(el),
                scrollPosX = el.scrollLeft,
                scrollPosY = el.scrollTop;

            if (el === winScroller) {
                canScrollX = width < scrollWidth && (elCSS.overflowX === 'auto' || elCSS.overflowX === 'scroll' || elCSS.overflowX === 'visible');
                canScrollY = height < scrollHeight && (elCSS.overflowY === 'auto' || elCSS.overflowY === 'scroll' || elCSS.overflowY === 'visible');
            } else {
                canScrollX = width < scrollWidth && (elCSS.overflowX === 'auto' || elCSS.overflowX === 'scroll');
                canScrollY = height < scrollHeight && (elCSS.overflowY === 'auto' || elCSS.overflowY === 'scroll');
            }

            var vx = canScrollX && (Math.abs(right - x) <= sens && scrollPosX + width < scrollWidth) - (Math.abs(left - x) <= sens && !!scrollPosX);
            var vy = canScrollY && (Math.abs(bottom - y) <= sens && scrollPosY + height < scrollHeight) - (Math.abs(top - y) <= sens && !!scrollPosY);

            if (!autoScrolls[layersOut]) {
                for (var i = 0; i <= layersOut; i++) {
                    if (!autoScrolls[i]) {
                        autoScrolls[i] = {};
                    }
                }
            }

            if (autoScrolls[layersOut].vx != vx || autoScrolls[layersOut].vy != vy || autoScrolls[layersOut].el !== el) {
                autoScrolls[layersOut].el = el;
                autoScrolls[layersOut].vx = vx;
                autoScrolls[layersOut].vy = vy;
                clearInterval(autoScrolls[layersOut].pid);

                if (vx != 0 || vy != 0) {
                    scrollThisInstance = true;
                    /* jshint loopfunc:true */

                    autoScrolls[layersOut].pid = setInterval(function () {
                        // emulate drag over during autoscroll (fallback), emulating native DnD behaviour
                        if (isFallback && this.layer === 0) {
                            Sortable.active._onTouchMove(touchEvt$1); // To move ghost if it is positioned absolutely

                        }

                        var scrollOffsetY = autoScrolls[this.layer].vy ? autoScrolls[this.layer].vy * speed : 0;
                        var scrollOffsetX = autoScrolls[this.layer].vx ? autoScrolls[this.layer].vx * speed : 0;

                        if (typeof scrollCustomFn === 'function') {
                            if (scrollCustomFn.call(Sortable.dragged.parentNode[expando], scrollOffsetX, scrollOffsetY, evt, touchEvt$1, autoScrolls[this.layer].el) !== 'continue') {
                                return;
                            }
                        }

                        scrollBy(autoScrolls[this.layer].el, scrollOffsetX, scrollOffsetY);
                    }.bind({
                        layer: layersOut
                    }), 24);
                }
            }

            layersOut++;
        } while (options.bubbleScroll && currentParent !== winScroller && (currentParent = getParentAutoScrollElement(currentParent, false)));

        scrolling = scrollThisInstance; // in case another function catches scrolling as false in between when it is not
    }, 30);

    var drop = function drop(_ref) {
        var originalEvent = _ref.originalEvent,
            putSortable = _ref.putSortable,
            dragEl = _ref.dragEl,
            activeSortable = _ref.activeSortable,
            dispatchSortableEvent = _ref.dispatchSortableEvent,
            hideGhostForTarget = _ref.hideGhostForTarget,
            unhideGhostForTarget = _ref.unhideGhostForTarget;
        if (!originalEvent) return;
        var toSortable = putSortable || activeSortable;
        hideGhostForTarget();
        var touch = originalEvent.changedTouches && originalEvent.changedTouches.length ? originalEvent.changedTouches[0] : originalEvent;
        var target = document.elementFromPoint(touch.clientX, touch.clientY);
        unhideGhostForTarget();

        if (toSortable && !toSortable.el.contains(target)) {
            dispatchSortableEvent('spill');
            this.onSpill({
                dragEl: dragEl,
                putSortable: putSortable
            });
        }
    };

    function Revert() {
    }

    Revert.prototype = {
        startIndex: null,
        dragStart: function dragStart(_ref2) {
            var oldDraggableIndex = _ref2.oldDraggableIndex;
            this.startIndex = oldDraggableIndex;
        },
        onSpill: function onSpill(_ref3) {
            var dragEl = _ref3.dragEl,
                putSortable = _ref3.putSortable;
            this.sortable.captureAnimationState();

            if (putSortable) {
                putSortable.captureAnimationState();
            }

            var nextSibling = getChild(this.sortable.el, this.startIndex, this.options);

            if (nextSibling) {
                this.sortable.el.insertBefore(dragEl, nextSibling);
            } else {
                this.sortable.el.appendChild(dragEl);
            }

            this.sortable.animateAll();

            if (putSortable) {
                putSortable.animateAll();
            }
        },
        drop: drop
    };

    _extends(Revert, {
        pluginName: 'revertOnSpill'
    });

    function Remove() {
    }

    Remove.prototype = {
        onSpill: function onSpill(_ref4) {
            var dragEl = _ref4.dragEl,
                putSortable = _ref4.putSortable;
            var parentSortable = putSortable || this.sortable;
            parentSortable.captureAnimationState();
            dragEl.parentNode && dragEl.parentNode.removeChild(dragEl);
            parentSortable.animateAll();
        },
        drop: drop
    };

    _extends(Remove, {
        pluginName: 'removeOnSpill'
    });

    var lastSwapEl;

    function SwapPlugin() {
        function Swap() {
            this.defaults = {
                swapClass: 'sortable-swap-highlight'
            };
        }

        Swap.prototype = {
            dragStart: function dragStart(_ref) {
                var dragEl = _ref.dragEl;
                lastSwapEl = dragEl;
            },
            dragOverValid: function dragOverValid(_ref2) {
                var completed = _ref2.completed,
                    target = _ref2.target,
                    onMove = _ref2.onMove,
                    activeSortable = _ref2.activeSortable,
                    changed = _ref2.changed,
                    cancel = _ref2.cancel;
                if (!activeSortable.options.swap) return;
                var el = this.sortable.el,
                    options = this.options;

                if (target && target !== el) {
                    var prevSwapEl = lastSwapEl;

                    if (onMove(target) !== false) {
                        toggleClass(target, options.swapClass, true);
                        lastSwapEl = target;
                    } else {
                        lastSwapEl = null;
                    }

                    if (prevSwapEl && prevSwapEl !== lastSwapEl) {
                        toggleClass(prevSwapEl, options.swapClass, false);
                    }
                }

                changed();
                completed(true);
                cancel();
            },
            drop: function drop(_ref3) {
                var activeSortable = _ref3.activeSortable,
                    putSortable = _ref3.putSortable,
                    dragEl = _ref3.dragEl;
                var toSortable = putSortable || this.sortable;
                var options = this.options;
                lastSwapEl && toggleClass(lastSwapEl, options.swapClass, false);

                if (lastSwapEl && (options.swap || putSortable && putSortable.options.swap)) {
                    if (dragEl !== lastSwapEl) {
                        toSortable.captureAnimationState();
                        if (toSortable !== activeSortable) activeSortable.captureAnimationState();
                        swapNodes(dragEl, lastSwapEl);
                        toSortable.animateAll();
                        if (toSortable !== activeSortable) activeSortable.animateAll();
                    }
                }
            },
            nulling: function nulling() {
                lastSwapEl = null;
            }
        };
        return _extends(Swap, {
            pluginName: 'swap',
            eventProperties: function eventProperties() {
                return {
                    swapItem: lastSwapEl
                };
            }
        });
    }

    function swapNodes(n1, n2) {
        var p1 = n1.parentNode,
            p2 = n2.parentNode,
            i1,
            i2;
        if (!p1 || !p2 || p1.isEqualNode(n2) || p2.isEqualNode(n1)) return;
        i1 = index(n1);
        i2 = index(n2);

        if (p1.isEqualNode(p2) && i1 < i2) {
            i2++;
        }

        p1.insertBefore(n2, p1.children[i1]);
        p2.insertBefore(n1, p2.children[i2]);
    }

    var multiDragElements = [],
        multiDragClones = [],
        lastMultiDragSelect,
        // for selection with modifier key down (SHIFT)
        multiDragSortable,
        initialFolding = false,
        // Initial multi-drag fold when drag started
        folding = false,
        // Folding any other time
        dragStarted = false,
        dragEl$1,
        clonesFromRect,
        clonesHidden;

    function MultiDragPlugin() {
        function MultiDrag(sortable) {
            // Bind all private methods
            for (var fn in this) {
                if (fn.charAt(0) === '_' && typeof this[fn] === 'function') {
                    this[fn] = this[fn].bind(this);
                }
            }

            if (!sortable.options.avoidImplicitDeselect) {
                if (sortable.options.supportPointer) {
                    on(document, 'pointerup', this._deselectMultiDrag);
                } else {
                    on(document, 'mouseup', this._deselectMultiDrag);
                    on(document, 'touchend', this._deselectMultiDrag);
                }
            }

            on(document, 'keydown', this._checkKeyDown);
            on(document, 'keyup', this._checkKeyUp);
            this.defaults = {
                selectedClass: 'sortable-selected',
                multiDragKey: null,
                avoidImplicitDeselect: false,
                setData: function setData(dataTransfer, dragEl) {
                    var data = '';

                    if (multiDragElements.length && multiDragSortable === sortable) {
                        multiDragElements.forEach(function (multiDragElement, i) {
                            data += (!i ? '' : ', ') + multiDragElement.textContent;
                        });
                    } else {
                        data = dragEl.textContent;
                    }

                    dataTransfer.setData('Text', data);
                }
            };
        }

        MultiDrag.prototype = {
            multiDragKeyDown: false,
            isMultiDrag: false,
            delayStartGlobal: function delayStartGlobal(_ref) {
                var dragged = _ref.dragEl;
                dragEl$1 = dragged;
            },
            delayEnded: function delayEnded() {
                this.isMultiDrag = ~multiDragElements.indexOf(dragEl$1);
            },
            setupClone: function setupClone(_ref2) {
                var sortable = _ref2.sortable,
                    cancel = _ref2.cancel;
                if (!this.isMultiDrag) return;

                for (var i = 0; i < multiDragElements.length; i++) {
                    multiDragClones.push(clone(multiDragElements[i]));
                    multiDragClones[i].sortableIndex = multiDragElements[i].sortableIndex;
                    multiDragClones[i].draggable = false;
                    multiDragClones[i].style['will-change'] = '';
                    toggleClass(multiDragClones[i], this.options.selectedClass, false);
                    multiDragElements[i] === dragEl$1 && toggleClass(multiDragClones[i], this.options.chosenClass, false);
                }

                sortable._hideClone();

                cancel();
            },
            clone: function clone(_ref3) {
                var sortable = _ref3.sortable,
                    rootEl = _ref3.rootEl,
                    dispatchSortableEvent = _ref3.dispatchSortableEvent,
                    cancel = _ref3.cancel;
                if (!this.isMultiDrag) return;

                if (!this.options.removeCloneOnHide) {
                    if (multiDragElements.length && multiDragSortable === sortable) {
                        insertMultiDragClones(true, rootEl);
                        dispatchSortableEvent('clone');
                        cancel();
                    }
                }
            },
            showClone: function showClone(_ref4) {
                var cloneNowShown = _ref4.cloneNowShown,
                    rootEl = _ref4.rootEl,
                    cancel = _ref4.cancel;
                if (!this.isMultiDrag) return;
                insertMultiDragClones(false, rootEl);
                multiDragClones.forEach(function (clone) {
                    css(clone, 'display', '');
                });
                cloneNowShown();
                clonesHidden = false;
                cancel();
            },
            hideClone: function hideClone(_ref5) {
                var _this = this;

                var sortable = _ref5.sortable,
                    cloneNowHidden = _ref5.cloneNowHidden,
                    cancel = _ref5.cancel;
                if (!this.isMultiDrag) return;
                multiDragClones.forEach(function (clone) {
                    css(clone, 'display', 'none');

                    if (_this.options.removeCloneOnHide && clone.parentNode) {
                        clone.parentNode.removeChild(clone);
                    }
                });
                cloneNowHidden();
                clonesHidden = true;
                cancel();
            },
            dragStartGlobal: function dragStartGlobal(_ref6) {
                var sortable = _ref6.sortable;

                if (!this.isMultiDrag && multiDragSortable) {
                    multiDragSortable.multiDrag._deselectMultiDrag();
                }

                multiDragElements.forEach(function (multiDragElement) {
                    multiDragElement.sortableIndex = index(multiDragElement);
                }); // Sort multi-drag elements

                multiDragElements = multiDragElements.sort(function (a, b) {
                    return a.sortableIndex - b.sortableIndex;
                });
                dragStarted = true;
            },
            dragStarted: function dragStarted(_ref7) {
                var _this2 = this;

                var sortable = _ref7.sortable;
                if (!this.isMultiDrag) return;

                if (this.options.sort) {
                    // Capture rects,
                    // hide multi drag elements (by positioning them absolute),
                    // set multi drag elements rects to dragRect,
                    // show multi drag elements,
                    // animate to rects,
                    // unset rects & remove from DOM
                    sortable.captureAnimationState();

                    if (this.options.animation) {
                        multiDragElements.forEach(function (multiDragElement) {
                            if (multiDragElement === dragEl$1) return;
                            css(multiDragElement, 'position', 'absolute');
                        });
                        var dragRect = getRect(dragEl$1, false, true, true);
                        multiDragElements.forEach(function (multiDragElement) {
                            if (multiDragElement === dragEl$1) return;
                            setRect(multiDragElement, dragRect);
                        });
                        folding = true;
                        initialFolding = true;
                    }
                }

                sortable.animateAll(function () {
                    folding = false;
                    initialFolding = false;

                    if (_this2.options.animation) {
                        multiDragElements.forEach(function (multiDragElement) {
                            unsetRect(multiDragElement);
                        });
                    } // Remove all auxiliary multidrag items from el, if sorting enabled


                    if (_this2.options.sort) {
                        removeMultiDragElements();
                    }
                });
            },
            dragOver: function dragOver(_ref8) {
                var target = _ref8.target,
                    completed = _ref8.completed,
                    cancel = _ref8.cancel;

                if (folding && ~multiDragElements.indexOf(target)) {
                    completed(false);
                    cancel();
                }
            },
            revert: function revert(_ref9) {
                var fromSortable = _ref9.fromSortable,
                    rootEl = _ref9.rootEl,
                    sortable = _ref9.sortable,
                    dragRect = _ref9.dragRect;

                if (multiDragElements.length > 1) {
                    // Setup unfold animation
                    multiDragElements.forEach(function (multiDragElement) {
                        sortable.addAnimationState({
                            target: multiDragElement,
                            rect: folding ? getRect(multiDragElement) : dragRect
                        });
                        unsetRect(multiDragElement);
                        multiDragElement.fromRect = dragRect;
                        fromSortable.removeAnimationState(multiDragElement);
                    });
                    folding = false;
                    insertMultiDragElements(!this.options.removeCloneOnHide, rootEl);
                }
            },
            dragOverCompleted: function dragOverCompleted(_ref10) {
                var sortable = _ref10.sortable,
                    isOwner = _ref10.isOwner,
                    insertion = _ref10.insertion,
                    activeSortable = _ref10.activeSortable,
                    parentEl = _ref10.parentEl,
                    putSortable = _ref10.putSortable;
                var options = this.options;

                if (insertion) {
                    // Clones must be hidden before folding animation to capture dragRectAbsolute properly
                    if (isOwner) {
                        activeSortable._hideClone();
                    }

                    initialFolding = false; // If leaving sort:false root, or already folding - Fold to new location

                    if (options.animation && multiDragElements.length > 1 && (folding || !isOwner && !activeSortable.options.sort && !putSortable)) {
                        // Fold: Set all multi drag elements's rects to dragEl's rect when multi-drag elements are invisible
                        var dragRectAbsolute = getRect(dragEl$1, false, true, true);
                        multiDragElements.forEach(function (multiDragElement) {
                            if (multiDragElement === dragEl$1) return;
                            setRect(multiDragElement, dragRectAbsolute); // Move element(s) to end of parentEl so that it does not interfere with multi-drag clones insertion if they are inserted
                            // while folding, and so that we can capture them again because old sortable will no longer be fromSortable

                            parentEl.appendChild(multiDragElement);
                        });
                        folding = true;
                    } // Clones must be shown (and check to remove multi drags) after folding when interfering multiDragElements are moved out


                    if (!isOwner) {
                        // Only remove if not folding (folding will remove them anyways)
                        if (!folding) {
                            removeMultiDragElements();
                        }

                        if (multiDragElements.length > 1) {
                            var clonesHiddenBefore = clonesHidden;

                            activeSortable._showClone(sortable); // Unfold animation for clones if showing from hidden


                            if (activeSortable.options.animation && !clonesHidden && clonesHiddenBefore) {
                                multiDragClones.forEach(function (clone) {
                                    activeSortable.addAnimationState({
                                        target: clone,
                                        rect: clonesFromRect
                                    });
                                    clone.fromRect = clonesFromRect;
                                    clone.thisAnimationDuration = null;
                                });
                            }
                        } else {
                            activeSortable._showClone(sortable);
                        }
                    }
                }
            },
            dragOverAnimationCapture: function dragOverAnimationCapture(_ref11) {
                var dragRect = _ref11.dragRect,
                    isOwner = _ref11.isOwner,
                    activeSortable = _ref11.activeSortable;
                multiDragElements.forEach(function (multiDragElement) {
                    multiDragElement.thisAnimationDuration = null;
                });

                if (activeSortable.options.animation && !isOwner && activeSortable.multiDrag.isMultiDrag) {
                    clonesFromRect = _extends({}, dragRect);
                    var dragMatrix = matrix(dragEl$1, true);
                    clonesFromRect.top -= dragMatrix.f;
                    clonesFromRect.left -= dragMatrix.e;
                }
            },
            dragOverAnimationComplete: function dragOverAnimationComplete() {
                if (folding) {
                    folding = false;
                    removeMultiDragElements();
                }
            },
            drop: function drop(_ref12) {
                var evt = _ref12.originalEvent,
                    rootEl = _ref12.rootEl,
                    parentEl = _ref12.parentEl,
                    sortable = _ref12.sortable,
                    dispatchSortableEvent = _ref12.dispatchSortableEvent,
                    oldIndex = _ref12.oldIndex,
                    putSortable = _ref12.putSortable;
                var toSortable = putSortable || this.sortable;
                if (!evt) return;
                var options = this.options,
                    children = parentEl.children; // Multi-drag selection

                if (!dragStarted) {
                    if (options.multiDragKey && !this.multiDragKeyDown) {
                        this._deselectMultiDrag();
                    }

                    toggleClass(dragEl$1, options.selectedClass, !~multiDragElements.indexOf(dragEl$1));

                    if (!~multiDragElements.indexOf(dragEl$1)) {
                        multiDragElements.push(dragEl$1);
                        dispatchEvent({
                            sortable: sortable,
                            rootEl: rootEl,
                            name: 'select',
                            targetEl: dragEl$1,
                            originalEvent: evt
                        }); // Modifier activated, select from last to dragEl

                        if (evt.shiftKey && lastMultiDragSelect && sortable.el.contains(lastMultiDragSelect)) {
                            var lastIndex = index(lastMultiDragSelect),
                                currentIndex = index(dragEl$1);

                            if (~lastIndex && ~currentIndex && lastIndex !== currentIndex) {
                                // Must include lastMultiDragSelect (select it), in case modified selection from no selection
                                // (but previous selection existed)
                                var n, i;

                                if (currentIndex > lastIndex) {
                                    i = lastIndex;
                                    n = currentIndex;
                                } else {
                                    i = currentIndex;
                                    n = lastIndex + 1;
                                }

                                for (; i < n; i++) {
                                    if (~multiDragElements.indexOf(children[i])) continue;
                                    toggleClass(children[i], options.selectedClass, true);
                                    multiDragElements.push(children[i]);
                                    dispatchEvent({
                                        sortable: sortable,
                                        rootEl: rootEl,
                                        name: 'select',
                                        targetEl: children[i],
                                        originalEvent: evt
                                    });
                                }
                            }
                        } else {
                            lastMultiDragSelect = dragEl$1;
                        }

                        multiDragSortable = toSortable;
                    } else {
                        multiDragElements.splice(multiDragElements.indexOf(dragEl$1), 1);
                        lastMultiDragSelect = null;
                        dispatchEvent({
                            sortable: sortable,
                            rootEl: rootEl,
                            name: 'deselect',
                            targetEl: dragEl$1,
                            originalEvent: evt
                        });
                    }
                } // Multi-drag drop


                if (dragStarted && this.isMultiDrag) {
                    folding = false; // Do not "unfold" after around dragEl if reverted

                    if ((parentEl[expando].options.sort || parentEl !== rootEl) && multiDragElements.length > 1) {
                        var dragRect = getRect(dragEl$1),
                            multiDragIndex = index(dragEl$1, ':not(.' + this.options.selectedClass + ')');
                        if (!initialFolding && options.animation) dragEl$1.thisAnimationDuration = null;
                        toSortable.captureAnimationState();

                        if (!initialFolding) {
                            if (options.animation) {
                                dragEl$1.fromRect = dragRect;
                                multiDragElements.forEach(function (multiDragElement) {
                                    multiDragElement.thisAnimationDuration = null;

                                    if (multiDragElement !== dragEl$1) {
                                        var rect = folding ? getRect(multiDragElement) : dragRect;
                                        multiDragElement.fromRect = rect; // Prepare unfold animation

                                        toSortable.addAnimationState({
                                            target: multiDragElement,
                                            rect: rect
                                        });
                                    }
                                });
                            } // Multi drag elements are not necessarily removed from the DOM on drop, so to reinsert
                            // properly they must all be removed


                            removeMultiDragElements();
                            multiDragElements.forEach(function (multiDragElement) {
                                if (children[multiDragIndex]) {
                                    parentEl.insertBefore(multiDragElement, children[multiDragIndex]);
                                } else {
                                    parentEl.appendChild(multiDragElement);
                                }

                                multiDragIndex++;
                            }); // If initial folding is done, the elements may have changed position because they are now
                            // unfolding around dragEl, even though dragEl may not have his index changed, so update event
                            // must be fired here as Sortable will not.

                            if (oldIndex === index(dragEl$1)) {
                                var update = false;
                                multiDragElements.forEach(function (multiDragElement) {
                                    if (multiDragElement.sortableIndex !== index(multiDragElement)) {
                                        update = true;
                                        return;
                                    }
                                });

                                if (update) {
                                    dispatchSortableEvent('update');
                                }
                            }
                        } // Must be done after capturing individual rects (scroll bar)


                        multiDragElements.forEach(function (multiDragElement) {
                            unsetRect(multiDragElement);
                        });
                        toSortable.animateAll();
                    }

                    multiDragSortable = toSortable;
                } // Remove clones if necessary


                if (rootEl === parentEl || putSortable && putSortable.lastPutMode !== 'clone') {
                    multiDragClones.forEach(function (clone) {
                        clone.parentNode && clone.parentNode.removeChild(clone);
                    });
                }
            },
            nullingGlobal: function nullingGlobal() {
                this.isMultiDrag = dragStarted = false;
                multiDragClones.length = 0;
            },
            destroyGlobal: function destroyGlobal() {
                this._deselectMultiDrag();

                off(document, 'pointerup', this._deselectMultiDrag);
                off(document, 'mouseup', this._deselectMultiDrag);
                off(document, 'touchend', this._deselectMultiDrag);
                off(document, 'keydown', this._checkKeyDown);
                off(document, 'keyup', this._checkKeyUp);
            },
            _deselectMultiDrag: function _deselectMultiDrag(evt) {
                if (typeof dragStarted !== "undefined" && dragStarted) return; // Only deselect if selection is in this sortable

                if (multiDragSortable !== this.sortable) return; // Only deselect if target is not item in this sortable

                if (evt && closest(evt.target, this.options.draggable, this.sortable.el, false)) return; // Only deselect if left click

                if (evt && evt.button !== 0) return;

                while (multiDragElements.length) {
                    var el = multiDragElements[0];
                    toggleClass(el, this.options.selectedClass, false);
                    multiDragElements.shift();
                    dispatchEvent({
                        sortable: this.sortable,
                        rootEl: this.sortable.el,
                        name: 'deselect',
                        targetEl: el,
                        originalEvent: evt
                    });
                }
            },
            _checkKeyDown: function _checkKeyDown(evt) {
                if (evt.key === this.options.multiDragKey) {
                    this.multiDragKeyDown = true;
                }
            },
            _checkKeyUp: function _checkKeyUp(evt) {
                if (evt.key === this.options.multiDragKey) {
                    this.multiDragKeyDown = false;
                }
            }
        };
        return _extends(MultiDrag, {
            // Static methods & properties
            pluginName: 'multiDrag',
            utils: {
                /**
                 * Selects the provided multi-drag item
                 * @param  {HTMLElement} el    The element to be selected
                 */
                select: function select(el) {
                    var sortable = el.parentNode[expando];
                    if (!sortable || !sortable.options.multiDrag || ~multiDragElements.indexOf(el)) return;

                    if (multiDragSortable && multiDragSortable !== sortable) {
                        multiDragSortable.multiDrag._deselectMultiDrag();

                        multiDragSortable = sortable;
                    }

                    toggleClass(el, sortable.options.selectedClass, true);
                    multiDragElements.push(el);
                },

                /**
                 * Deselects the provided multi-drag item
                 * @param  {HTMLElement} el    The element to be deselected
                 */
                deselect: function deselect(el) {
                    var sortable = el.parentNode[expando],
                        index = multiDragElements.indexOf(el);
                    if (!sortable || !sortable.options.multiDrag || !~index) return;
                    toggleClass(el, sortable.options.selectedClass, false);
                    multiDragElements.splice(index, 1);
                }
            },
            eventProperties: function eventProperties() {
                var _this3 = this;

                var oldIndicies = [],
                    newIndicies = [];
                multiDragElements.forEach(function (multiDragElement) {
                    oldIndicies.push({
                        multiDragElement: multiDragElement,
                        index: multiDragElement.sortableIndex
                    }); // multiDragElements will already be sorted if folding

                    var newIndex;

                    if (folding && multiDragElement !== dragEl$1) {
                        newIndex = -1;
                    } else if (folding) {
                        newIndex = index(multiDragElement, ':not(.' + _this3.options.selectedClass + ')');
                    } else {
                        newIndex = index(multiDragElement);
                    }

                    newIndicies.push({
                        multiDragElement: multiDragElement,
                        index: newIndex
                    });
                });
                return {
                    items: _toConsumableArray(multiDragElements),
                    clones: [].concat(multiDragClones),
                    oldIndicies: oldIndicies,
                    newIndicies: newIndicies
                };
            },
            optionListeners: {
                multiDragKey: function multiDragKey(key) {
                    key = key.toLowerCase();

                    if (key === 'ctrl') {
                        key = 'Control';
                    } else if (key.length > 1) {
                        key = key.charAt(0).toUpperCase() + key.substr(1);
                    }

                    return key;
                }
            }
        });
    }

    function insertMultiDragElements(clonesInserted, rootEl) {
        multiDragElements.forEach(function (multiDragElement, i) {
            var target = rootEl.children[multiDragElement.sortableIndex + (clonesInserted ? Number(i) : 0)];

            if (target) {
                rootEl.insertBefore(multiDragElement, target);
            } else {
                rootEl.appendChild(multiDragElement);
            }
        });
    }

    /**
     * Insert multi-drag clones
     * @param  {[Boolean]} elementsInserted  Whether the multi-drag elements are inserted
     * @param  {HTMLElement} rootEl
     */


    function insertMultiDragClones(elementsInserted, rootEl) {
        multiDragClones.forEach(function (clone, i) {
            var target = rootEl.children[clone.sortableIndex + (elementsInserted ? Number(i) : 0)];

            if (target) {
                rootEl.insertBefore(clone, target);
            } else {
                rootEl.appendChild(clone);
            }
        });
    }

    function removeMultiDragElements() {
        multiDragElements.forEach(function (multiDragElement) {
            if (multiDragElement === dragEl$1) return;
            multiDragElement.parentNode && multiDragElement.parentNode.removeChild(multiDragElement);
        });
    }

    Sortable.mount(new AutoScrollPlugin());
    Sortable.mount(Remove, Revert);

    Sortable.mount(new SwapPlugin());
    Sortable.mount(new MultiDragPlugin());

    return Sortable;

})));
